So most of you know of this $50 off coupon originally meant for Yahoo! Small Business:
https://adwords.google.com/select/ma...urceid=Yh91503
But with the eComXpo conferences it seems that AdWords AND AdCenter are releasing coupons:
AdWords:
http://services.google.com/ads_inquiry/ecomxpo2006
AdCenter: ecomxpo1006 - Just type it in at the end of sign up
here
P.S. Might want to bookmark this post on del.icio.us for future references