+1
I love being able to change the look of my phone and don't understand why Apple doesn't support that yet. For me it's the main reason I Jailbreak.
As much as I love my JB iPhone though, not being able to JB would not be a deal breaker. The AppStore has made it less necessary.
However, I was discussing the upcoming Slingplayer app with a coworker yesterday and realized if for some reason Apple does not approve it for the AppStore - THAT would be a deal breaker for me!