!top (drag to Links-bar)
A bookmarklet simulating how I would like the Home key to behave in browsers: press once to jump to top of page, then press again to jump back to where you were.
I've already found this to come in quite handy while reading various Metafilter threads, deciding halfway down the page I'd better check out the link people are talking about... :)
Anyhow, suggestion to add Bottom also.
So Top, Bottom, & [i]back[/i] in round-robin fashion.