To this point in time, addresses on Facebook were disgusting to look at and annoying to link to. But beginning on June 13th, you can now get “vanity” links for your public profiles and fan pages.
For the complete details about this, please see the Facebook blog post and the post specifically for page administrators.
While you can always use a URL shortening service, having a simple link to your page is as valuable as a domain name. Facebook is going to try to address any issues regarding trademark, but the best thing to do is to show up and reserve the names for your pages.
If you have yet to setup a Facebook fan page for your business, you may want to take this opportunity to simply setup the page to act as a placeholder for when you are ready to move forward with Facebook as a part of your online marketing strategy. Questions? Just let me know.