Stumbi

Stumbi is a StumbleUpon (@/?) plugin for Safari. A solution to the oldest problem in existence - the only path forward for mankind. Be the envy of your friends and stumble in Safari!

The current version (1.0) features:

Stumbling and voting
Toolbar buttons
Submitting discoveries
Send-to-a-friend
See reviews of current page

Try out Stumbi for 100 stumbles. After that it'll guide you through the simple steps to chuck us $4 to buy it for good.

(Stumbi requires SIMBL, which is included in the download and installs automatically)

Download - Source

Uninstaller included in the disk image.