Love is in the air, which makes it the perfect time to take a walk down (lovers') memory lane with 20 of TV's all-time best couples. From the will-they-or-won't-they duos of 'Cheers' and 'Moonlighting' to current faves Jim and Pam and Mer and McDreamy, these tube twosomes all have one thing in common: We love to love them, baby.  The Love Connection: It all started with a one-night stand, but they've got their own game of will-they-or-won't-they going: Will they choose steady coupledom over their merry-go-round of relationship drama? They've survived his ex-wife and her insecurities, which makes us think Der (Patrick Dempsey) and Mer (Ellen Pompeo) are meant to be.  The Love Connection: She was as whiny as he was James Dean-wannabe cool, but who didn't begrudgingly root for Brenda (Shannen Doherty) and her hot '90210' bad boy (Luke Perry)? The two were a match made in teen TV heaven. Well, until that other, blonder, TV princess stepped in . . .  The Love Connection: He's (John Astin) a lawyer who takes pride in losing cases; She's (Carolyn Jones) a glam goth chick who beheads flowers. They're also a pair who keeps the passion alive, even with two kids and a houseful of pets and in-laws. They're creepy and they're kookie ... and altogether okie-dokey in our book.  The Love Connection: Wrong-side-of-the-tracks brainiac Joey (Katie Holmes) and charming slacker Pacey (Joshua Jackson) engaged in cute verbal sparring, shared a hot chemistry and supported each other when their families were MIA. In other words, it was Dawson's name in the title, but it was these two lonely soulmates who proved to be the show's ultimate love match.  The Love Connection: From the start, Jim (John Krasinski) and Pam (Jenna Fischer) were an obvious love connection stuck in a cycle of bad timing. And as "Jam" fans will attest, the sweet island of relative sanity they've created has so far managed to be just as interesting and endearing since they finally got together.  The Love Connection: Kevin (Fred Savage) and Winnie (Danica McKellar) started off the series with their first kiss, and through several breakups and makeups, we saw a first love evolve. Kevin's voiceover in the series finale reveals the two didn't wed, but they're still the most endearing of TV's childhood sweethearts.  The Love Connection: Bobby (Patrick Duffy) and Pam (Victoria Principal) were married on the sly and endured years of sabotage attempts by both their brothers. Throughout such tragedies as miscarriages, a fiery car crash and her infamous nightmare about his death, they remained in love.  The Love Connection: She (Claire Danes), the poster child for teen angst, was in love with the popular slacker (Jared Leto). When they actually began dating, he turned out to be deeper than he seemed, but also careless about her feelings. In one of TV's most realistic portrayals of teen romance, they went from sizzle to fizzle.  The Love Connection: Unconditional love keeps Homie (Dan Castellaneta) and Marge (Julie Kavner) together. The first couple of animated TV will do anything for each other, even, in Homer's typically misguided case, divorcing Marge so he can remarry her and give her a better second wedding.  The Love Connection: Dr. Doug's (George Clooney) callousness led to a suicide attempt by Nurse Carol (Julianna Margulies) in the pilot, but he finally put his womanizing days behind him to settle down. Via a season 14 shout-out, we learned the couple and their twin girls are still happily together in Seattle.  The Love Connection: They were enemies who became on-again, off-again lovers. Logan (Jason Dohring) described the pairing as "spanning years, and continents. Lives ruined and blood shed." But Veronica (Kristen Bell) inspired him to become a better person, and the series finale left us hoping for a reunion.  The Love Connection: Cliff (Bill Cosby) and Claire (Phylicia Rashad) were role models as parents -- who didn't want to be a Huxtable? -- but their respect for each other, and their commitment to taking time to snuggle on the sofa, even with five kids and two careers -- made them role models as a couple, too.  The Love Connection: Teasing glances and references to their off-camera bedroom were, along with her trademark Capri pants, risqué for the time. Their devotion, comic interactions and Rob's (Dick Van Dyke) obvious appreciation for how Laura (Mary Tyler Moore) looked in those outfits made the Petries one of prime time's first sexy couples.  The Love Connection: She was a spoiled princess, he was an uptight nerd who'd loved her since high school; even through their infamous "break," marriages (to others and each other) and accidental parenthood, Ross (David Schwimmer) and Rachel (Jennifer Aniston) were always destined to be more than 'Friends.'  The Love Connection: Police captain Furillo (Daniel J. Travanti) and public defender Davenport (Veronica Hamel) butted heads professionally by day but shared a bed at night. Their intimate interactions provided a deeper portrait of even-tempered Furillo, and helped the drama transcend being a mere cop show.  The Love Connection: The ultimate star-crossed pair, Buffy (Sarah Michelle Gellar) and Angel (David Boreanaz) consummated their relationship, only to find that their love (and his perfect happiness) sparked Angel's murderous side. Surely the first time a Gypsy curse has been the cause of a prime-time breakup.  The Love Connection: Though she often ruined his gigs with her shenanigans -- like getting drunk during the Vitameatavegamin commercial -- Lucy's (Lucille Ball) good intentions and Ricky's (Desi Arnaz) love for his wacky wife saved their marriage and made them TV's first supercouple.  The Love Connection: The on-again, off-again affair began when they met on a sidewalk in New York, and continued through Big's (Chris Noth) marriage to another woman and Carrie's (Sarah Jessica Parker) engagement to another guy. Fans' desire to see them happily ever after sparked this spring's 'SATC' movie.  The Love Connection: PIs David (Bruce Willis) and Maddie (Cybill Shepard) tried to mask their attraction to each other with a barrage of witty banter, including a take on 'The Taming of the Shrew.' But when their "will they or won't they" turned into a "they did," viewers fled the series in droves.  The Love Connection: Brainy waitress Diane's (Shelley Long) dislike of her boss, womanizing bar owner Sam (Ted Danson), was so passionate that it was inevitable they'd end up in the bedroom. Their entire affair involved a careful, and always hilarious, walk down the fine line between love and hate.
Our Top 20 TV couples include Sam and Diane from 'Cheers,' David and Maddie from 'Moonlighting,' Carrie and Big from 'Sex and the City,' Lucy and Ricky from 'I Love Lucy,' Buffy and Angel from 'Buffy the Vampire Slayer,' Furillo and Joyce from 'Hill Stree