Booyah is the parent company of the MyTown location-based check-in service that competes directly with Gowalla and Foursquare. Booyah has raised $20 million in funding from Accel, Kleiner Perkins Caufield & Byers, and DAG Ventures. Accel partner Jim Breyer will be joining the board of directors at Booyah.

Location-based check-in service Booyah has hit 2 million users. The company is on track to hit about 500,000 users per month very soon. Booyah was designed by a company called MyTown and they reached the 2 million milestone this past week. Foursquare has about 1.1 million users and Gowalla has about 250,000 users. [TechCrunch]