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The Profile Web Address application (it's actual application name is unnecessarily long) lets you create a direct link to your profile, with any name you choose. This application comes from the same people that created the "Surveys, Petitions, Votes, Polls & Quizes" Facebook app.
Just like with MySpace, you can now pick a URL suffix to create a somewhat shortened, easy-to-remember web address that can be sent out to friends or placed on websites, taking them directly to your Facebook profile. The URL you'll be able to use will look like any of these three options:
http://profile.to/AnyNameYouChoose/
www.profile.to/AnyNameYouChoose
http://apps.facebook.com/profiles/AnyNameYouChoose/