Google has introduced experimental new features in Gmail. These experimental features are being called as Gmail Labs. You can check out these features under ‘Labs’ in ‘Settings’.
Please note that these are experimental features & may disappear temporarily or permanently. Google wants you to send feedback on Gmail Labs to the Labs group- http://groups.google.com/group/gmail-labs
Enjoy the new features & send your feedback whilst they are under development.
Rajbir Singh | 

What exactly does this do?
By Milind on June 7th, 2008 at 4:46 pmCheck out the Labs page under settings. They have given detailed info about what those features do. Personally I didn’t find anything useful for me.
By Rajbir Singh on June 8th, 2008 at 6:16 amThey’ve introduced Gmail labs only for people using GMail. So if you use Google apps, you wont use the ‘Labs’ tab.
By Ritesh on June 11th, 2008 at 4:07 am