Beating Falling Leaf to the punch, members of the hacking group Razor1911 have managed to hack the Vista-only Shadowrun to work on Windows XP, the Inquirer reports. The crack, weighing in at less than 5 MB, reportedly removes the need for DirectX 10. (No, we're not linking to it -- you can find it yourself.)
With the crack, you can only play single-player against bots or multiplayer LAN games. Falling Leaf, who has stated they will be providing free code for those who purchase the game on Amazon via their pre-order page, still estimates cracks for Vista-only Shadowrun and Halo 2 by "late July."