This is something really cool that a client introduced me to yesterday. Go to www.stumbleupon.com and sign up for a free account and download the tool bar. When signing up enter some of your interests. Once the toolbar is installed and you are all set up, click on the stumble button. It will take you to a random website that is related to yoru interests. You can refine your criteria by clicking on the thumbs up or thumbs down buttons on the tool bar.
I have been playing a little bit with it today and have found a number of sites with cool utilities and information I knew nothing about.
I encourage you to give it a try!