Google now offer additional adwords notifications:

• Disapproved Ads Notifications – emails to inform you whenever an ad has been disapproved
• Account Performance Suggestions – account optimization suggestions and tips
• Newsletters – periodic updates with industry-specific information
• Google Market Research – opportunities for you to provide feedback and participate in AdWords research programs
• Special Offers – other offers such as promotions and beta testing opportunities

These can be located in the account preferences section of the My Account tab.