I think this may be the best posting on the Skip Gates arrest case — The Reality-Based Community: Nightmare on Ware Street.
You can read the full police report here.
PS. I know Prof. Henry Louis Gates from way back — we had the same Mellon fellowship in different years — and he was, then at least, universally known as 'Skip'.
Update (7/25): The post at Justice Building Blog looks good too, especially in light of some of the comments below.