In the past, if you want to access StumbleUpon on your iPhone/iPod Touch, you will know that it is not an easy task. Back then, SU only exists as a Firefox extension and does not plays well with any of the mobile devices. However, with the launch of the SU web toolbar, anyone can now access StumbleUpon on any browsers without having to install any applications/extensions. The best thing, it works fine in iPhone/iPod Touch too.