I've been reading a lot about the task killer and AV apps here, but I am wondering if... 1 - are TK apps really nessessary? Does it help with battery life and why would you want to kill an app? I've read somewhere that TK apps are not nesscessary b/c android is a linux system. 2 - Can we get viruses on our phones? Are the Free AV apps we get here in Canada, since we cannot buy apps, good? Do they really protect our phones? I have a HTC Magic w/Rogers. Thanks in advance for your tips and opinions.