Hi,
I've been using a program called Better Touch Tool for the last two weeks, I found this in an article from Mac User magazine (19/11/10 issue).
http://boastr.net/
Download the latest version here:
http://blog.boastr.net/?page_id=1722
This program offers many custom gestures for both the track pad and magic mouse. It toke me a week to work out the best combination for my needs, and now I have about a dozen different settings mapped to the trackpad instead using combination key commands. The program also offer window snapping like you get in Windows 7, its located under Action Setting.
Give this free program a try for a week, and I'm sure most of the inaccurate track pad problems will disappear.