I got Sparrow set up as the default mail app and enabled push notifications. That was one thing I missed quite a lot when I upgraded to iOS 6, I've been making do with Gmail for the past month or two but Sparrow is so much nicer.
Also, the new LockInfo is very clean, a completely different design philosophy than the old "infodump" version. It's a free upgrade to existing users and it's currently on sale for $3.99, with a 14 day free trial. Intelliscreen X refugees, or anyone seeking some sort of lockscreen usability increase, may want to give it a look.