Gmail Labs - Do you use any of its features?

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How many of you use features in Gmail Labs? So far I have Quick Links, Superstars, and Signature Tweaks enabled. I really like Signature Tweaks, because I prefer my signature to be right under my reply rather than right under all replies. It's just clearer that way. Superstars I use mainly because Gmail doubles as a task manager for me, so Superstars help me mark which tasks are done, to-do, or in-wait. What about the rest of you? Has anyone got Old Snakey to work? (I haven't, unfortunately...)