Provides a really good introduction to Twitter, plus loads of related links to other posts about using Twitter to market your business or service. Heres an excerpt:
"The savvy Twitter user realizes that the effective communications aren’t just ‘pushing’ content to readers, but they will also dialogue and converse with others by replying to them. I use this tool as a global chat room, responding to others, building relationships, and listening in. Like blogging, the rule of anti-marketing marketing is required for success, engage your community. Unlike traditional forms of advertising and marketing, Twitter is “opt-in” meaning that users will ‘follow’ a twitter account, abuse will result in a user unsubscribing. "