Hi, you can download some new user created scenarios from this forum at:
http://forum.shrapnelgames.com/forumdisplay.php?f=140
Though some of them are not fully playtested. But it's worth a look.
Also you can download scenarios at theBlitz scenario database:
http://www.theblitz.org/scenarios/sh...os.php?game=25
Most of them are already included on your downloaded game, though...