This one is for StumbleUpon (www.stumbleupon.com). I heard some people talking about StumbleUpon, so I tried it out by installing the Firefox toolbar. I'm finding it an interesting way to find new stuff on the web.
I discovered the StumbleUpon blog button over at GigaOM. I was there checking out their new Sphere contextual widget. I found their link quite similar to my other blog buttons, so it was very easy to add.
http://www.stumbleupon.com/submit?url=(encoded permalink)&title=(encoded post headline)
Please feel free to use my button graphics and code if you would like to add these to your own blog. Just do a search here for blog button to see how I did the others.