MobileStar is now known as T-Mobile.
From their site: Get broadband wireless Internet access for your laptop or PDA at the speed of a T1 connection. Use the service in over a thousand locations, including airports, airline clubs, and Starbucks for fast, easy Internet access. Unlimited plans start at $29.99 monthly.
T-Mobile Hotspot Locations - http://locations.hotspot.t-mobile.com/
More information - http://www.t-mobile.com/hotspot/
Pricing Plans - http://www.t-mobile.com/hotspot/services_plans.htm
More information http://www.starbucks.com
