Here are a few high-resolution photographs of me, for conferences and such:
(Those are huge, print-ready images, so they may take a while to load.)
If none of those are quite what you're looking for, there are other similar images available. You can also browse the original JPEGS straight from the camera; much thanks to Rick Falkvinge, leader of Sweden's Pirate Party and an excellent amateur photographer. Note that some of the raw JPEGS would need to be rotated 90 degrees.
If you need something less formal, try this:
(Taken by Mike Pilato in Chicago's Grant Park in the summer of 2005. Thanks, Mike!)