No, I don't but if you ask on Classroom 2.0 (a big Ning social network or teachers) you're bound to get responses from a much bigger community.

Regards

Leigh

sheryl barnes wrote:
> I'm looking for an easy to use, free (or very low cost) tool to allow students to sign up for office hours online. Doodle and Google calendar get close, but are not quite right.

I post automatically to both, but Diigo is more powerful. I know others whose Delicious entries stopped on the day they signed up with Diigo.