Google Site Search has been added to aypsite.org. Searches done here will pull up results from the AYP lessons, Forums, Links Section and every other nook and cranny of the AYP website. You can also expand your searches to the entire web here as well. Pretty handy. See: http://www.aypsite.org/SiteSearch.html
For easy access, this link has been been added to the "Overview and Announcements" forum header text. It can also be reached from the top menu of all the AYP lesson pages.
The Snitz Forum search (on top menu here) is still the way to go for specific searches in the AYP Forums, because it will shade search terms in yellow in the results -- much easier to find. Google does not provide the "cached" pages with shading of search terms for their site search feature like they do for their standard web searches.
If you want to search all the AYP lessons and also see where your search terms show up site-wide, Google Site Search is the way to do it.