I was unhappy when Safari lost the Page Snapback command from the History menu. This command would take Safari back to the very first History page for that window/tab. Well, here's a little javascript bookmarklet that does the same job.

javascript:history.go(1-history.length);

Create a new bookmark, and enter that into the Address field. I keep mine on the bookmark bar, and it works fine for my needs. I wish I had thought of this sooner!