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It also wouldn't hurt to log into Google Webmaster Tools and see if there are any messages to the webmaster from Google in there about any problems.

I'm currently reading a book called "In the Plex" by Steven Levy which talks about how Google got started.  They talk about how Google learned to predict relevance.  I'll paraphrase the example because I don't have the book in front of me. Let's say someone typed in the search phrase - i want to buy a cat, and they get their page of search results.  But let's say that they immediately go back and do another search.  (This tells Google that their results didn't provide an answer).  So this time they type in, i want to buy a kitten.  Now, Google knows that cat and kitten are relevant to each other.  Similarly, if their next search was i want to buy a devon rex then Google knows that cat, kitten, and devon rex are all similar terms.  Of course, the algorithm wouldn't change for just one user's search but rather if hundreds of people were interchanging cat for kitten then eventually the algo learns that they are relevant to each other. So, how can you use this for seo purposes?  Check out this search for i want to buy a cat -cat The "-cat" tells Google not to include searches that use the word cat.  So, you get results that Google thinks are relevant to I want to buy a cat.  From this search I can see that I should also be targetting the words, kitten, persian, siamese, main coon, etc. This is a quick off-the-top-of my head example, but you could certainly play with it.

That would be my guess too. That is strange...

There is a whole Learn SEO section at SEO Moz and I would also recommend becoming aware of Google's SEO advice at:- http://www.google.com/support/webmasters/bin/answer.py?answer=35769 and a PDF guide http://www.google.com/webmasters/docs/search-engine-optimization-starter-guide.pdf Hope this helps!