Twitter - I just don't get it

A lot of the SEM industry is twitting away.... tweet tweet tweet, but not ShoeMoney... I tried it ... I just do not get it. I read the other day Darren Rowse's post about twitter and how much it has increased his blog readership. I think its a good post and I made note to maybe look into twitter again... but I still don't get it. Do you use twitter? What do you use it for?