Back in the days before Mac OS X Lion (not to mention ), I used a handy trackpad gesture when I found myself mired in a particularly lengthy web page that would let me jump back to the top. I just swiped upward on the trackpad with three fingers and I was right back at the top of the page.
When OS X Lion hit, one of the many features it introduced was Mission Control, which you accessed by swiping up with three fingers (or all four, if you tweaked a setting in System Preferences). Mission Control is great and all (particularly when used with keyboard shortcuts), but it took away a useful tool of mine.
In related news, you'd be right if you said Command and the down arrow let you skip to the bottom of a Web.