I think the problem may be that Google thinks searches originating
from peachyforum's search box are automated. Automated searches
without Google's consent are blocked. Yes, the search isn't automated,
but Google seems to think it is, so it blocks them.
As for the work around already mentioned, you can go a step
farther to make searching even easier, if you're using Firefox.
Bookmark this link:
http://www.google.com/search?q=site%3Apeachyforum.com+%s
Open
your bookmarks menu, right click on the bookmark you just added, and
select properties. You should get a dialog box that has fields for
name, location, keyword, and description. Type a word in to the
keyword field, I use peachy. Now, to test it out: type peachy dani
woodward in the URL bar and hit enter. Google should load with the
results for site:peachyforum.com dani woodward.