Google has a new "CL2" calendar using AJAX. Here's the details from TechCrunch. Sounds like it will be a while before it's released though.
I've been trying out a new calendar from 30Boxes that works reasonably well. What I like about the company is that they have active discussions with their users and make improvements fairly quickly based on feedback.
And yes, I've been gone for about a week and a half. Sorry for no posts, but I was vacationing in the Seattle area. I'll post a couple pictures later.