Nag yourself into doing good

http://www.hassleme.co.uk/ is simple yet ingenious. The site sends you emails at 'semi-unpredictable intervals' to remind you to do something. This can be whatever you want. Some ideas on the more good-making side of things:
- call your mom
- buy cake for a friend
- read about current affairs
- check your electricity usage
- make contact with an elected official about an issue that concerns you
- be slightly less rude than usual to a person who drives you up the wall


Effort involved: the service is so simple that it only takes a few seconds to set up the alerts.