RE: Task killers: FroYo has one built in, and running a second one is like running a second antivirus software on your computer -- they'll interfere with each other, get in each others' way, and bog things down like mad. You only need one. I have a dandy analogy for that, but it's non-family-friendly and probably inappropriate even though I don't swear in it. Having lots of apps running won't eat your battery unless they're pulling data or keeping the screen alive. Your phone clocks waaaay down unless the CPU is being polled, and when you turn the screen off it goes to sleep, further reducing battery drain. The biggest battery-users on a stock phone are the radio -- 3G and phone calls -- and the screen. The main theory behind using the task killer was to free up memory, but that's a near non-issue in the Android OS, and doubly-so on FroYo due to improved memory handling. The Android OS was built with the idea that the RAM would be limited in the first place, and provisions were made. Without getting too technical I can say you can trust your designers!