I emailed HTC about an issue of my OTA update not working, they sent me this.
Dear Dutin Keller,
Thank you for the response.
HTC is going to update all HTC Desire Android 2.2 software, so currently FOTA service for upgrade to Froyo is currently offline and will be available very soon. Google has halted OTA updates for many Android devices until the issue with Android Market is resolved. The update will not work on the Desire until this issue is resolved. Once it is resolved, a newer update will arrive on the phone to correct the current issues. I do apologize Dutin for any confusion and for any inconvenience you may have experienced.
To send a reply to this message or let me know I have successfully answered your question log in to our
ContactUs site using your email address and your ticket number .
Sincerely,
Peterson
HTC
Hope this helps for Desire users