Search engines biased toward their own advertisers...?

Since first posting ( 9/14/2005 - Are major search engines going to favor
web sites that carry their ads and hurt those that don't?) about the idea
that some search engines may be favoring sites that carry their own ads,
which was an idea brought to my attention by a site that offers a cloaking
product to hide ad code from search engines, I have been contacted by one
person that has confirmed that it seems like this may be true. They are
going to provide some additional testing and let me know if they can offer
additional evidence.

I'm not going to mention what site this is so that the results of their test
cannot be affected by someone reading about the testing.

If you have seen something like this, either before or after hearing about
it, please let me know so we can increase awareness on this issue.

Thanks,
(hris