Safari contains a number of new-and-existing keyboard commands. To see the entire list, click the Safari icon and choose "Show Package Contents." In the new window that opens, navigate to Contents -> Resources -> English.lproj -> Shortcuts.html. Nothing earth shattering. Enjoy!
[Editor's note: Wow, I wish all apps were required to have this file in their bundle! It would save everyone a fair bit of searching. Also, make sure you check out the Safari Help pages if you haven't done so already; they're quite complete, although there are fewer shortcuts listed in the Help than there are in this HTML document.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030108100943888