Just an update, I have had my trusty desire now for almost 4 months, I've kicked the addiction that was my iPhone and can never see myself going back.
I almost got the hype to go back with the iPhone 4 but managed to get through them dark days.
I just thought I would list on here the reason why I think the Desire is so great and why I won't be going back.
1) Customisation
It never ceases to amaze me how much I can change things,
I have picture frames (picture of soon to be wife and pet rabbit) on the desktop
moving wall papers (Super Mario one is great)
I can change my ring tone again without having to pay Apple (not that I did)
links to URLS and people on the desktops
Folders (one of the standout features of iOS 4)
Setting profile (auto change settings based on time of day, location etc)
ton's of techies customization settings (the fact I can click on an icon to turn bluetooth off without having to drill down through several manuals
I can cut and paste files to the storage card.
2) I can change my battery and my storage

I have a desktop charger with two batteries and I have recently purchased a 32 GB SD card, my big concern always with the iPhone was the battery and replacement.
I have two batteries with me now so I never worry that I can't turn on Googlemaps if I'm lost. Also with Settings profile my battery has improved.
3) There's an APP for that.
Everyone including myself said the music player and sms wasn't as good, I simply went and got
btunes ( pretty much as good as iphone) .
handcent (great SMS client)
Dolphin Web Browser (amazing browser, you can use swipe gestures to load websites)
Games - solved this and just got an NES/SNES emulator off the market place.
I pretty much have all the apps now I had on my iphone, I can't wait for Froyo to become standard as it should bring more developers. I have also noticed a large amount of apps that were only available on the iphone coming to Android.
Likewise I can use a barcode scanner in the phone to download an app I see mentioned on a website without having to go to an app store
4) Integration
Seamless integration with everything I use
Camera hooks in Flickr and Facebook
Contacts sink to google
Video Camera sinks to youtube.
App for the CCTV cameras I have at home.
I could go on and on, the Desire isn't perfect but there is soooo much potential .
5) My phone isn't controlled by Jobs and co and his overpriced tarriffs.
For anyone reading this, give your phone a chance, if you are new from Apple stick with it.