Using photos from my site...
People are always welcome to use my photos on their Facebook, MySpace, forums, etc. If you do, go ahead and "friend" me. I usually don't get an opportunity to meet the people I shoot and I always like the chance to get to know people a little more. You're also free to use my photos for personal stuff like desktop wallpaper, etc. If you need to use it for something commercial, just email me.
Other than that, the only thing I ask if you use my photos publicly, that you give me credit for the work. A link to my site is nice, but not required. : )