One more thing about Twitter - use the # hashtags for every tweet that you want to be targeted. That way you reach people who aren't following you and vice versa.

For example - I only really tweet about homeschool stuff so every time I have something to say I put the #homeschool hashtag in my tweet and then I reach everyone who reads #homeschool.

It works much better that way.

In addition, if I want more homeschool targeted followers I search for #homeschool and find people who use the hashtag and follow them.

Effective Twittering really is an art.

You can find out more about hashtags here: http://mashable.com/2009/05/17/twitter-hashtags/