wrote in news:1145125925.925098.16400
@e56g2000cwe.googlegroups.com:

All windows, doorways, and wall corners have crappy wooden trim
borders:
When I take the trim off, there is a gap between the dry wall and the
sash.
What can I use to fill the gap?
And how can I ensure that the gaps between wall corners maintains a
sharp edge like this?

Trim is the normal method for accomodating differences in thickness (and
expansion ratios). Try some of these products for finishing your drywall
without the need for trim pieces:
http://www.dietrichindustries.com/products/

You should probably still expect small cracks to appear at some boundaries
-- various parts of your house will expand and contract by differing
amounts, and trim pieces are the usual method for accomodating this.

--
Murray Peterson