"Android task killers improve your phone's performance while also boosting battery life-or at least that's the much-debated promise. Here's a look at how task killers actually work, when you should (or shouldn't) use them, and what you can do instead."
This is an article that every new Android user should read. Especially if you are coming over from the Windows Mobile world as I did. Back in my WinMo days it was a constant battle to keep enough free RAM for my device to run smooth and fast so the first thing I did when I got my shiny new Nexus One was to find myself a nice task killer. This was, of course, until I realized that I was killing my calendar reminders, my alarms, and who knows what else. Once I learned how Android handled memory management and background processes I removed that pesky task killer. This is a must read for all Android users. Head over and check it out and share your task killer horror stories with us.