So I've been playing with my new iPhone 4, and when I double-tap the home button I'm surprised to see every app i've had open on the app-switcher. I definitely don't need these all to be open, and I'm concerned it'll bog down my phone. How are you all handling this issue? Are you just not worrying about it? Do you quit your apps right after you're done with them? (I was really just planning to use multi-tasking for the occasional Pandora use...)