The unlocking tool -- developed with Microsoft's blessing and help -- is aimed primarily at homebrewers interested in developing Windows apps.
"ChevronWP7 Labs was designed to allow hobbyist developers to install, run, and debug unsigned applications on their personal Windows Phone. You log into the site with your Windows Live ID, pay a small fee, and presto — you’re ready to write and share some homebrew code," the team members Rafael Rivera, Chris Walsh and Long Zheng blogged.
The WP unlocking tool, which comes in 32-bit and 64-bit flavors, costs $9 per Windows Phone unlock. Homebrew app developers who want to publish their apps to the Windows Phone Marketplace still need to register for a Microsoft App Hub account.