Hi there,
Just came across this forum. I had an HTC Desire which has gone back for repair after 4 months. Meanwhile, I've got hold of a Samsung Galaxy S. I stuck my comments about the differences in
http://androidforums.com/desire-support-troubleshooting/162887-home-key-problems-htc-desire.html#post1560243
Overall, the Samsung has the Desire beat in terms of anything needing a large screen (eg video, ebook...). However, I prefer the Desire and can't wait to get it back (despite the areas where the Samsung is better).