from: http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=40907 The limits for an AdWords account are: 25 campaigns 100 ad groups per campaign 2000 keywords per ad group 50 ads per ad group (any format) About 50,000 keywords per account Most advertisers do not reach this limit. In fact, many accounts are best organized by creating one campaign and several ad groups within that campaignand two or three ads and 10-35 keywords within each ad group.. Learn more about structuring [ ... ]