Hey Jeff,
If you claim a listing, you can edit the details (name, title, description, category,etc) once your ownership is verified. To get rid of the other listings, you can either use the "report a problem" link and flag it as a duplicate, or claim the additional listings and make them identical to the others. Google will merge them, so i've heard.
I dont have any personal experience with getlisted.org but I have heard good things about it. I've heard it mentioned here on SEOmoz a few times in blog posts.
