Similar to yesterday’s tip, you can press Ctrl+0 to hide the column where the cursor is located. Ctrl+A, Ctrl+Shift+0 unhides all the columns in the sheet.
Update on January 5, 2014:
This keyboard sequence is used for changing your language by Windows, preventing it from working in Excel. If you’re running an older version of Windows, see Guilherme’s comment below.
In Windows 7, try this to get this shortcut to work in Excel:
1. Run the Control Panel, and select Region and Language.
2. Select the “Advanced Key Settings” tab.
3. Select the “Between input languages” item, then press Alt+C to select the Change Key Sequence item.
4. Under “Switch Keyboard Layout” make sure that “Not Assigned” is selected, then select OK and OK.
That will fix ALL keyboard shortcut items that involve Ctrl+Shift.