Ever closed a browser tab, then immediately realized you still needed it open? Maybe you even waited a few minutes before you wanted to go back. Fortunately, you don't need to go hunting around for it in your history or search for it again.
I've already partially mentioned this tip (buried in the middle of another), but here it is again: Just press Ctrl-Shift-T.
Here's the new part: In Chrome, you can also middle-click the New Tab button to reopen the previous tab. I discovered this by accident the other day while trying to close the last tab I had open (I missed it and hit the new tab button instead).
While you're at it, check out four other ways to use your middle mouse button when you're browsing (and find out what a middle-click is, if you haven't picked up on it from my tips yet!).