7/11/09 updated. I didn’t know Warren, but have been frankly amazed by the guys dedication to the users of his software. People far more eloquent than I have already blogged about his influence on the Pymol community, and he will be sadly missed by us all.
For short bios and dedications I recommend you go to:
Warren DeLano has passed away. Brief notes have been posted at ccp4 and the pymols lists.