accidentally deleted a dock icon - don't know which one
I was dragging around in the new Google Earth, and I accidentally managed to grab a dock icon and let go, before I knew what was happening. I heard the poof sound, and vaguely saw the poof cloud disappear, so I'm pretty sure I deleted an icon. Thing is, I don't know which one. Now you might say, well if you don't know which one, it can't be that important. Still, I want to put it back. Can anyone tell me how to get a handle on what I changed? I have Time Machine running, but the desktop doesn't show the dock. Any help appreciated - this site has been a great resource in the past.
Joe
p.s. Apple. if you're reading - I don't think it should have been that easy to accidentally make an not-obviously-undoable change...
MacBook Pro 15" 2.5 GHz, Mac OS X (10.5.6)