Create a dropdown for a custom user field, is this possible?

[JoshFink]

I would like to add an extra user profile field called "Neighborhoods", ok, no problem there.. Done right through the CP.

Now, I want to make the field a drop down in the Registration process and the Edit Profile from the user CP that pulls its info from an a table that I'm going to add to the database.

Kind of works like the "Style" drop down does, where it lets you select the different styles as the default style.

Josh