Open Thread: Which Labs Features Should Google Incorporate into Gmail?

One of the things I like most about Gmail (s goog) is Labs, the experimental add-on features that you can enable through Settings -> Labs or via the little green flask icon next to your email address at the top right of the screen. Most of these features are put together in Google employees’ 20 percent time, and many of them are actually very useful.

Google very occasionally incorporates Labs features into Gmail (the Forgotten Attachment Detector, for example) but many of them seem destined to remain stuck as Labs features forever, and so probably won’t be seen by most Gmail users. With that in mind, which Gmail Labs features you think should “graduate” and become part of Gmail itself?

Here are the Labs features that I’d nonimate:

Leave your picks in the comments.