As I’ve mentioned before, the Mozilla Calendar project, which includes the Lightning calendar extension to Thunderbird, is moving right along. It’s currently at version 0.7, heading towards a 0.8 release ASAP. I’ve asked the Calendar team how I can help, and the answer has been clear — they need more developers. So if you’ve been sitting on the sidelines of either Calendar or Thunderbird and you want some suggestions as to where you could help, check out this bug list. Moving Lightning forward is one of the easiest ways to help move Thunderbird forward — the codebase is in quite a healthy state, there’s an active group of daily contributors (check out the #calendar IRC channel to meet them), the roadmap is clear, and the bugs are clearly marked.