I got this message from google recently, and Im not sure what to make of it. I have been successfully using analytics for months, so maybe this is a mistake? Any one seen this before? "It's come to our attention that your AdWords account has not been properly linked with your Google Analytics account. If you do not link your accounts by March 5, 2008, we cannot ensure that your data from AdWords will continue to populate in your Analytics account."
Their just telling you that if you want data and statistics from your adwords campaignes to show up in your analytics, you got to link the two together. Read this for more information: http://www.google.com/support/googleanalytics/bin/answer.py?answer=55507