P.s. I wrote this reply using my desire. Didn't even have to get out of bed to get my laptop.
Oh I have massive hands btw so if I find this keyboard insane, normal sized hands will cream over it.
I'm not sure why people are saying the Desire is the better phone. Apart from Sense UI (and maybe Samsungs previous handling of their other Android phones) the Galaxy is a much better all around phone. The battery life, screen camera and 3d rendering are all much better. And remember Samsung have stated all their Galaxy range will get 2.2.
Go into the store and check out the Galaxy S's Super AMOLED screen and see the difference.
HTC Desire, I am getting this once my contract finishes!
I had the desire, sold it for the Samsung and would never look back! it does lag in certain situations a little bit however overall much faster than the desire. Plus the Super AMOLED screen is far brighter!
I have the desire and have had 0 problems. Battery life isn't amazing but with the amount I use I can ardly moan at having to charge it once a day.
Personally I don't like Samsungs and after using the HTC I was impressed so went for it and definitely don't regret it.