Criterion Games' Burnout Paradise demo, which hit Xbox Live today, is also available. It weighs in at 764 MB in its PS3 form.
A number of cars and car packs for EA Black Box's Need for Speed ProStreet are available for purchase, with pricing ranging from $2.49 to $9.99. Check the PlayStation Blog for details; all cars can be obtained free by progressing in the game.
Finally, new High Velocity Bowling characters are available for $0.99 each.