Earn Double XP In Killzone 3 This Weekend
To welcome players back to the newly restored PlayStation Network and Killzone 3 multiplayer, Sony had declared a Double XP weekend.
The promotion has already started and will run through 3AM Monday morning. During that time, you'll earn double the XP in all online multiplayer matches.
The blog post announcing the promotion also notes that PSP owners can also download Killzone: Liberation for free as part of Sony's larger Welcome Back program. It also teases "And there's even more...But we'll announce that at a later date."