After reading about the Wake-on-Demand feature of Snow Leopard, it got me thinking about why I never put my iMac to sleep. The reason is because if i put it to sleep, I lose my network connection. In other words, the only reason I keep my iMac awake: to stay signed on with iChat. (There's other stuff too, like downloading something or seeding a torrent, but they are very rare occasions, and I wouldn't mind turning sleep off for those, then turn it back on once done). I think AIM or Apple should introduce a feature where you can stay signed on even after you disconnect, like how it works with the iPhone. That way your computer can go to sleep, and you will still receive your messages. You will receive them as soon as you wake up your Mac and re-connect to the internet. Yes, I know about off-line IMs, but it's not the same, and people are much less likely to leave messages if I appear offline. Thoughts?