I’ve been really digging 30 Boxes, as reviewed by Mr Hawk here and Mr Malik here, I’m moving all of my calendaring (online and off) into it. They’re doing some neat stuff with profiles and sharing that I think will take people a while to fully grok. The only thing I think it needs is better timezone handling (I travel a lot). Check out their blog. (Powered by WP.) Update: I keep finding cool features like it automatically detects when you enter a birthday and offers to repeat it every year. The whole site is like a giant easter egg.