Any devs care to shed light on this? I for one don't want the system to be closing apps that "aren't being used"! For instance, I might have a Terminal open, with an ssh to a server where I'm running something that updates once in a while. I don't want that Terminal to close! Also, just because I'm "not using" an IM client or Twitter at the moment doesn't mean I want it to close! Plus, modern machines have 4-8GB and more of RAM; is this something that's really necessary? Hopefully we can disable it. I'm guessing this will be an opt-in feature for apps, but with Apple you never know. More information from devs on this would be wonderful. So far it's the only thing about lion that concerns me a bit.