We've just set up a new website that lets anyone browse StumbleUpon with Safari, the iPhone or iTouch, or any other browser. Currently the official StumbleUpon toolbar only supports FireFox or Internet Explorer. For anyone who hasn't used StumbleUpon, it's a great way to discover websites that may be of interest to you.
Try out the site at stumblephone.com
The old version can be found at: wordjot.com/su/su.php