I’ve been using it so intensely, i had to write an entry for it: StumbleUpon. In my eyes one of the best and most original FireFox extensions ever made.The idea is pretty simple: install the StumbleUpon plugin, register, log in and start surfin’!. The beauty of it is that it doesn’t send you to any random website. No, it lets you chose (pretty detailed) favorite topics, which are taken into account when forwarding you to a specific website. You can also vote for the link you were forwarded to, and the website keeps a nice lists of your ‘goods’ and ‘bads’. When rating some links each day, it finetunes your profile so your forwardings get even more accurate, based on your preferences.
Really, if you use FireFox (and i hope you do), try out this extension!
Hmm, I was looking throught your blog, and noticed this post, looked interesting, I saw it @ the plugin site of mozilla, but never realy cared about it.. Now I’m using it non-stop
I put you blog in my other blog links 
grtz Furedragon..