Looks like yesterday's update contained a whole messload of Transformers stuff, in addition to picture packs and themes from several other games. See the whole list below:



Marketplace Content for July 16, 2007
The following content is now available on the Xbox Live Marketplace.


Theme

Title: Transformers: The Game


Content: Transformers G1 Decepticons Theme
Price: 150 Microsoft Points
Availability: All regions except Hong Kong, Japan, Korea, Singapore, Taiwan
Dash Text: