I am slightly terrified that this is going to blow up beyond a reasonable discussion, so I'm going to start by asking people to keep things civil ^^; Background: I picked up my HTC Incredible back in May. It was my first smartphone, and consequently my first Android phone, with 2.1 and HTC Sense. Upon researching apps to pick up, task killers came up frequently. I grabbed Advanced Task Killer and got into the habit of using it right from the start. This morning, I woke up to a notice that Froyo was ready to be installed on my phone. Sweet! After updating, one of the first things I noticed was that ATK wasn't working. Apps that I would kill would come back up almost immediately. If I wanted to kill an app, I had to go to Settings -> Applications -> Manage applications, and even that wasn't all that reliable. Upon researching the issue, I came across something curious. It seems just about every search result for 'advanced task killer froyo' ended up being arguments over the idea of task killers in the first place. While there seemed to be some adamant voices on both sides of the argument, there wasn't a whole lot of reasoning behind either side. So rather than just "Task Killers: Yay or Nay?", I'd like to ask what I think is the important question in this argument: Why? Don't tell me what I should or shouldn't do, but rather explain to me why I should or shouldn't do so I would like to add for my personal case, performance is not an issue. I've never really had any performance issues on my Incredible, although I've never had an abundance of apps running due to my task killer habits. I am, however, obsessive about battery life. Over the past few months, it has become clear to me that some apps (for example, Hi AIM, my AIM client of choice) definitely eat up more battery when they are open. The point I'm trying to make, when stating your case, please clarify what aspect (performance, battery life, and/or whatever else) you're referring to. I'm hoping this can be a topic people can refer to when they end up in a similar situation to mine, so let's make it a nice discussion that's easy to sort through and find answers Thanks!