Snipe is a Safari and Chrome extension that allows you to quickly sift through the sea of open tabs you accumulate throughout the day. Simply invoke the keyboard shortcut and up pops a Quicksilver-like input field allowing you to search through your open tabs and select one, without ever leaving your keyboard.
This is extremely clever. The search is fuzzy, too, so you don’t have to get the title or subject exactly right. If you wind up with lots of tabs, you want this.