Google has graduated (they are now part of Gmail) three lab features.
- Automatic Message Translation
- Title Tweaks
- Smart Mute
I like the "Automatic Message Translation" most :)
Other lab feature were less successful and have been retired:
- Old Snakey
- Mail Goggles
- Mouse Gestures
- Hide Unread Counts
- Move Icon Column
- Inbox Preview
- Custom Date Format
- SMS in Chat gadget (SMS is still working, but the lab feature has been removed).
Read the full story here.