I see no end to this trend anytime in the near future.  GameStop probably puts up a good amount for these as they seem to happen for about every game released.   Here is the latest deal for Tiger Woods PGA Tour 11 for the PS3 and Xbox 360. I don’t have any knowledge if the courses will be available in any other form after release. From a GameStop email:

We’re also excited to bring you virtual access to some exclusive courses. Pre-order the PS3 version to get the GameStop Exclusive TPC Blue Monster at Doral as a premium download. Pre-order the Xbox 360 version to download the GameStop Exclusive Riviera Golf Club. Supplies are limited for both.