Where did the command-backtick keyboard shortcut go in 10.7 Lion? With every Mac OS X I've ever used, hitting command-backtick (`) cycled to the next window.  I just installed Mac OS X 10.7 (on top of a perfectly fresh 10.6), and command-backtick does nothing at all.

Did this feature go away?
This feature is still present (I'm using 10.7.3 and it works for me).

Go to System Preferences > Keyboard and check the keyboard shortcuts. In the list of 'Keyboard &amp; Text Input' shortcuts you should see 'Move focus to next window'
⌘+`. 

Make sure it is checked, and it should work.