On Tuesday night StumbleUpon is changing the way users interact with the service, ditching the need for a software-based browser toolbar in place of a small frame that loads on top of the Web site you're on. Users with the toolbar installed will still be getting the same experience, but the idea is that anyone can begin stumbling without having to install anything.

To get the Web toolbar to show up in the first place, users must now begin their stumbling experience from the StumbleUpon home page. The site is now broken up into categories. Once you've clicked on a link the experience begins, with the persistent toolbar following you from site to site and keeping track of your ratings to provide you with new stumbles.