Unlockable Character in Perfect Dark
Back when Perfect Dark hit Xbox Live Arcade, we mentioned how the debug menu has a "Fake Crackdown 2 save presence" option. Now it's purpose has been revealed by Rare; A new playable character called Agent 4, available in the Combat Simulator.
Buried within Perfect Dark XBLA is a playable character known as Agent 4. If you own PD, and you're planning to pick up Crackdown 2, this feisty black-suited gun nut will soon be under your command. When Perfect Dark detects a Crackdown 2 save file on your device, it'll automatically make Agent 4 available for use in the Perfect Dark Combat Simulator (aka the multiplayer modes). No further cost involved.
Crackdown 2 is released in the US on July 6th, Asia Pacific/Australia/NZ on the 8th and Europe on the 9th (although the demo's out now if you fancy a taste). Suit up and share the run 'n' gun love with our Perfect Dark crossover combatant.
UPDATE: After a quick check, it looks like Crackdown 2 doesn't check for a Perfect Dark save, so it seems that it doesn't have any unlockable Perfect Dark stuff.