I'm baffled too ... we were in the middle of a project (bare in mind, he's been a perfect client for a number of projects)... we were both excited about the work we were doing ... one of the domains we did work for was
http://www.vaginate.com/
We did the design and layout coding etc ... and for some reason he just ... dissapeared. We had other projects on the go.
I miss him coz he was great and I really hope he's ok!!!