lazyweb - heirs to mozcal/sunbird?

[trochee]

I've been less than thrilled with Sunbird, the Mozilla-suite calendaring program.

It works okay, but it doesn't seem to be robustly supported. (In November 05, they released 0.3 alpha, after nearly a year of silence.)

The key features I'm looking for are:

1. the ability to sync against webDAV calendars, such as the one at iCal Exchange, which I currently use. It's not enough to pull them down, it has to be able to push local edits up too.
2. The ability to subscribe to multiple calendars -- I keep separate calendarfiles for my lab, my classes, and my personal time. But I'd like to look at them all in the same place.

Sunbird currently does both these critical pieces, yet I'd like to get away from it.

Any recommendations?

Update: looks like the Mozilla Calendar extension to Firefox manages to avoid the biggest Sunbird problems -- namely, that it isn't packaged for Debian or Ubuntu. And I can get Firefox to work just about everywhere.