This was touched on in a comment from a prior hint, but I think it's worth a standalone hint: You can drag any text to Safari's dock icon to perform a Google search of that text.
This is useful for quickly checking up on things without going to the keyboard. I discovered this when, on a whim, I dragged a line from Console onto Safari, and it brought up a search of that Console error.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20080619191307294