Multiple forums have reported over this weekend that Microsoft adCenter is having a promotion again. Use this link and promo code BNR-100-1006 to receive a $100 credit when you sign up.
Offer valid through January 15, 2007, valid for new accounts only (a one time $5 activation charge will apply), valid for the first 1000 who sign up. For more details read the discussion at SlickDeals and DigitalPoint.
it worked! thanks