Google Labs have rolled out three new features for Gmail Lab users; these are Superstars, Nested Labels and Advanced IMAP Controls! However, as with any new addition to a service, there must be a sacrificed and in this case, it looks like the Google Search Box lab feature has been withdrawn.
These are the details and features for the new Gmail Lab additions;
Superstars, one of the most popular Labs features, provides different types of stars in addition to Gmail’s basic one.
Nested Labels are a great way of organizing your email; nested labels give you the ability to organize labels hierarchically.
Advanced IMAP Controls provides very useful set of advanced controls for those of you who access Gmail through IMAP clients (e.g. Outlook, Thunderbird, or your iPhone’s native mail app).
Source [Geeky Gadgets]