Something I'm not sure on and would appreciate a bit of insight please.I installed a task killer and had a look at what was running...woooo loads of stuff. I thought that they had closed down. I killed everything and saw the memory go back up to 96 Meg. As a test I opened the browser hit the back button and using task killer again I saw that the browser was open and memory had dropped to 89. Not unexpected.I then went back to browser and used the x at the top right which I assumed closed the browser. Back to task killer and it shows as still open. The same happens for other apps I open, eg, Astro. I even used the exit from the home menu but it was still running according to task killer.Is that the way android works? Tasks need to be killed? They cant be closed or am I doing something wrong. Of course this would explain why my PDN runs like a bucket at times. Too many things open and memory in the basement levels.