Hey I did the same thing, and when it was pointed out to me I was a little bummed out, but thankful that my domain name was available with the wp instead of WordPress. CrazyWordPressGeek.com sounded real good, but now I'm running on CrazyWPGeek.com which doesn't sound as good, but works.

The domain with WordPress in it expires later this year, and I'm probably going to let it expire at that time. RIght now I think it still forwards traffic to my site (maybe a few hits a month at most).

I won't make this mistake again. It was another WP user who sorted me out on this to, so keep doing this and letting people know, since not a lot of people check on that stuff.

Kevin