Check this thread for a start...
http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=2443
And I have a few notes here:
http://www.naplak.com/modeling/tips/decaling.htm
Never put decals on flat paints... you can clear coat some gloss, or use Future. Then apply the decals, use a setting solution, and flat, or gloss coat over the top.
www.naplak.com/modeling ... a free site for modelers
www.scalehobby.com/forum/index.php ... a nice Modeling Forum