I spotted today that Gowalla is innovating on the business model front:

Companies (or anyone really) can get a custom stamp for their spot (vs a generic coffee cup, etc), plus the spot gets special promotion inside Gowalla. Prices vary, but a spot tomorrow in Austin is only $150. But, if you want to promote your spot for next August in San Francisco, it’ll cost you a little over $1,000.

I’m thinking these could make great Christmas presents. Find out more and get your own badge here.