hope this will be a quick easy question, I’ve just tried my app on my old phone and it looks better (personal oppinion) on my older HTC Desire then my newer Samsung SII. The main part is the rounding of corners on most things. Do you know where that is coming from? Manufacture or Droid Version? and can I force the rounded corners without resorting to massive amounts of effort on the samsung, and I presume most handsets?
HTC is v2.2.2
samsung is v2.3.4


What you are seeing here are manufacturer specific themes. HTC Devices run the so called Sense UI. While on Samsung devices you find TouchWiz.
If you want to have the Sense UI look & feel on Samsung Devices you indeed need to resort to (massive) amounts of efforts by creating your own theme or custom widget styles.
Cheers
Renard