Sony has an offer on the PSN, currently sitting in the top row of "Latest", there is a theme to download. Download it with your PSPGo! and you can get Granturismo, Motorstorm or Assassins Creed as a free download (code emailed within 30days).
Download theme before January 10
This is basically a free £23!! :-D
Sorry if it has been posted, couldnt see it.