Google has posted an update to their blogger account notating some new changes to their mobile version of Gmail. From the looks of it, scrolling looks to be much improved as far as smoothness goes. Before the pages seemed to be a bit more choppy and the distance it would scroll wasn't always very accurate. That problem appears to be fixed.
They've also added a floating toolbar that will remain static even when you scroll. This should make it a lot easier to jump around your mailbox instead of having to scroll all the way back up a long thread in order to return to your inbox or another folder. Google is noting these updates are compatible with devices running iOS 4.0 and up.