My wife asked me today if there was an app to auto respond with an 'away/meeting/unavailable' SMS if anyone tries to call when she is in a meeting. I think I have seen this mentioned here before but not sure if there is actually such an app for the N900.
If not how hard it would be to write a script to grab the caller ID and bounce back an 'away' sms. Maybe there is an existing script that can be run as a daemon when the phone is set to silent mode or another custom meeting mode in the notification area, not sure how to detect that though. I am happy to just get a few links to get me started if this is not already available on the repos.