chiyo - 3:42 am on Feb 28, 2003 (gmt 0)
i agree with skibum. 2 to 3 % is a brilliant CTR. Banner ads usually had an average of .05%. And on Google you are competing against high quality core SE results, Premium listings and internal links as well as other Adwords. There must be more than 100 links on each page, of at least 30 to 60% being "quality informational links" about the same thing you are selling.