A good article on lifehacker.org with some good uses for Twitter.

- Quick Human Answers

- Conference / News Briefings

- Friendsourcing

- Micro-Attention-Sharing

- Direct People to Good Causes

- Bonus- As advertised, Twitter answers the question “What are you doing?” It means that you can stay in touch with others without being intrusive. Just follow their twitters.

Full article here..