Ever wondered why Microsoft Office 2007 documents didn't seem to appear in the search results of Windows Sharepoint Services? Hmmm, turns out, according to Microsoft "This problem occurs because a 2007 Office IFilter is not installed".
Is there a solution? Well yes and no. Yes in the fact that there is this KB article, and no in the fact that it involves installing Word and hacking the registry of the Sharepoint server. Now we're not too sure whether this happens on EVERY Windows Sharepoint installation or just in some circumstances but we can tell you that if it does the solution is sure nasty.
I think that perhaps it is a good idea to wait a while until Microsoft releases a proper patch for this problem. In the meantime we'll have to check to see whether all our Sharepoint sites are affected.