If you want to know how to get it the link is below. HOWEVER IT IS AT YOUR OWN RISK I WILL NOT BE HELD RESPONSIBLE FOR DAMAGE OF YOUR PHONE. IT WILL VOID YOUR WARRANTY.
root your phone first:
http://android.modaco.com/content/htc-desire-desire-modaco-com/307365/24-may-r5-htc-desire-rooting-guide-now-with-hboot-0-80-and-os-to-1-21-support/
Then flash Android 2.2 froyo:
http://forum.xda-developers.com/showthread.php?t=690477
In this video i show android 2.2 froyo running on the Htc desire, i go through some of the features such as flash, app2sd etc.
If you have any questions feel free to ask.
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