WPCentral reports that members over at XDA have released a Mango ROM for the HD2, complete with a working Marketplace. 

In an interview with All Things D, Microsoft's Bill Cox says the following about hacking the HD2: “We say tinker away with Mango and enjoy the juice...But beware the fine print — unlocking phones may void your warranty.” Nice to see Microsoft taking a more laid-back approach to the XDA devs.

  Mango with Marketplace on HD2