In switching from Maemo to Cyanogenmod this month, one of the nicest applications I found in F-Droid has been Tacere, which reads from your calendar to automatically switch the ring mode while events are active.

It's 90% what I had imagined developing myself! In Maemo, I used a bash script with fcrontab to autosilence my N900 on regular times every week (e.g. during regular rehearsals, classes, mass, etc.). But I'd always wished I had a way to read from the calendar, to catch one-off events, like a meeting or concert, and automate the silence.

Tacere basically does this! The only issues I've had so far is that by default it assumes you want it to take action for all events in a calendar, whereas I really just want to whitelist a few events... that's possible, but a bit counterintuitive given some of the design assumptions. Second issue is... I'm not entirely sure I have it working yet... I've had it ring when it was supposed to be silent! But I'm not sure I've got it configuration properly, so could be a user error... Still, very excited of the potential to get this working properly!

Also, a nice surprise, since this was one of the things I was expecting to lose from my N900, not improve.