similar issue here
Jason, I'm having the same issue mentioned above, but I'm pretty sure my client's site is indexed with Yahoo. If I try searching the following at Yahoo.com “site:www.positiveid-bt.com projects” (or using any other keyword found throughout the site) I do get search results from Yahoo (see attached). But the search field on the site itself only returns 1 search result that takes you to the index page. I've also submitted and authenticated the site through Yahoo's Site Explorer and for the past couple of months it only shows 2 -3 pages as being indexed. One week it says 2, then another week it will say 3. It fluctuates for some reason, but never goes beyond three pages. So, I'm confused... is the site indexed or not.
I've also done a test where I changed the $search_BOSS_domain in the results.php page to a value like www.amazon.com. It works flawlessly - you get 1000+ results searching for a keyword like “books.” so I'm reluctant to think that the php code is faulty.
Im not sure if this makes a difference, but I have the search field implemented as a php include using Framework Builder. It doesn't seem to interfere though since my test using amazon.com works.
