For those of you that are considering joining Twitter here are a few simple guidelines that may help you start off:
1. Add value
2. Share information that you found interesting the Web that related to your business or your speciality interest.
3. Use a Web service that provides short aliases for redirecting for long URLs. TinyURL or a similar url abbreviation tool to shorten the length of url links in your Twitter posts so they fit in the 140 character limit.
4. Look at Twitter as a forum to let followers know what it is you do for a living - you never know who might read and say I need someone to do just that for me.
5. Don't spam or sell.
6. If someone starts following you don't automatically add them and follow take a look at the number of followers they have compared to their following. If they are following way more people than they have followers then it might be best to avoid them - chances are they are only looking to follow so that they can in turn spam you.
7. Don't let Twitter suck up too much of your time - it can be very distracting.
8. Limit the number of people you follow to avoid Twitter overload.
