Bob - I find it extemely useful.  I think a lot of people end up using twitter backwards.  Many think you need to post all of your activity on there and then people will "discover" you, strike up a conversation and you'll build a relationship that leads to a sale.  That is a traditional marketing model and it doesn't work well on twitter.

A better approach is to use twitter to listen.  Tools like tweetdeck are very good for this.  When you find someone talking about something where your expertise would be of value to them, then strike up a conversation, build a relationship, close the sale.

The reality is that people probably aren't on twitter looking for houses or realtors, but the insights into their lives that they post there can give you an indicator that they could benefit from talking to you.  It's all about finesse.

I should probably expand this into a blog post!  Thanks for the great idea!

Li!  Thanks for the kind words and encouragement.  I should have it out within the week!

Steve, oh man....I wanted to be the first! ;-)  Out of curiosity, who was the other?  Thanks for stopping by and commenting.  Check back soon for that twitter post.