Here are the statistics on one of our sites for the first week of March. We are well placed in all search engines and use AdWords, Over & FindWhat. I do not know if these statistics include the PPC searches.
Total site visits - 7054
Google - 1647 - 67.52% of search engine visits Yahoo - 351 - 14.39% MSN - 321 - 13.16% Ask Jeeves - 56 - 2.29% AV - 56 - 2.29% Lycos - 5 - .04% ATW - 1 - .04% Direct Hit - 1 - .04%
We have been in the Yahoo directory since 1999 and still have good placement in addition to our Over paid listings.
What really is surprising is ATW where we are in the top for most of our searches and still terrible numbers. As we have a world wide audience and get a lot of business from Scandinavia my only conclusion is that nobody is using their search engine.