Oh man, you're finally back, both posting puzzles here and on nikoli.com. This was the first place I had seen original, handmade logic puzzles posted in blog form, which inspired my own, and nikoli.com had the link that led me here. Maybe I should drop my own inactivity to commemorate this... although I have the same excuse that I've been constructing for other things.

I'll comment on the puzzle later, if I find the time to solve it. Unfortunately, Sudoku isn't a big hit with me, so it might be a bit.