A few months back I launched XBLA Ratings and had a giveaway for 1600 Marketplace Points. 

With the launch of the New Xbox Experience and XNA Community Games this week I have added XNA games to the site.

To celebrate the growth I'm having another 1600 Point Giveaway.

T enter just rate an Xbox Live Arcade or XNA Community Game. 
Limit 1 entry per person per Arcade or XNA game. 
The entry period starts now and runs through December 31th 2008.

Full details here

Good Luck