From The Major, here is the latest batch of new Xbox Live Marketplace content:

Themes
Carcassonne (150 points)
300 Theme (150 points)

Clips and Coverage
Day 4 Wrap Up (HD)
Chuck Highlights (HD)
The Sarah Connor Chronicles Highlights (HD)
Supernatural Highlights (HD)
Chuck Full Panel Coverage
The Sarah Connor Chronicles Full Panel Coverage
Smallville Full Panel Coverage
Pushing Daisies Full Panel Coverage