Keep your Mac Awake.
Does your screensaver kick in while you’re watching a video on hulu.com? Or your screen go asleep while you’re watching twitlive.tv or the AuburnCom office camera?
Get Caffeine, a tiny Mac only program that puts an icon in your menu bar, before you click play on the big lebowski, tap this and it’ll keep your Mac awake for you, no visits to the system pref pane for you!