I just came across a post by Brendan Griffin on the From the Field Blog ( great blog by the way!) about this long awaited release of a 64bit iFilter for pdf from Adobe. It is finally there. Read more about it on http://www.adobe.com/support/downloads/detail.jsp?ftpID=4025
The installation procedure for SharePoint is available which requires you to play around in the registry to make it actually work.
This release will probably be bad and sad news for Foxit Software that was until now one of the only suppliers of a 64bit PDF iFilter on the market.