After reading alot of posts on a number of forums, I'm definately only going to use Twitter to keep in touch with existing customers and lists, rather than try to promote product for new business.

Sometimes it's more valuable to keep reminding those who know you and trust you about what you're doing and about plans you're making. They'll keep visiting your sites and will always be aware of your latest projects, without having to give them the hard sell. Sounds good in theory, anyway

Steve.