That's only for vodafone Desires. If you manually download the file its riddled with vodafone software and wouldn't work when I tried to install it
The Vodafone phones are not "riddled with software".
Vodafone have done absolutely no customisation on the software at all.
The reason it won't run on other non-Vodafone Desire's is because it will only upgrade from 1.15.161.4, which again is a Vodafone specific release.
I'm assuming the other carriers will be releasing a firmware upgrade soon.
Please note this isn't to be confused witht he future Android 2.2 release, this is purely a firmware upgrade for the phone.