Blossom and Hijack. Although I will definitely concede that Cookbook looks cool and would be useful, just not to me, so I could never get super psyched for it. Atmosphere started out as being one of my favorites, I was psyched for it from day one. Then, as I read folks' criticisms of it, I started to think maybe they were right (it's useless, just look out the window, etc). Now I am kind of lukewarm on it, but hoping for big things.
I don't get why more people aren't way into Blossom. I think it's SO freaking cool.
Omit needless words.