This sucks on so many levels.
Both coppervale and ellen_datlow have posted heartfelt thoughts about him. As much as I have wanted to since I read Mythago Wood, I never met him. We never corresponded. I only know him through his works.
Damn. There are many people who actually knew Robert who have more immediate reasons to mourn. Everyone who loved his writing, though, but didn't know him personally, will join the throng. I'll be in that group.