I've just updated the search facility on the project's website to use a Google Custom Search that will search not only the project website and wiki, but also the mailing list archives[1] and the project's codebase. I hope it is an improvement over what we had before.
It's available at:
http://perl-win32-gui.sourceforge.net/search
and from the navigation bar on every other page.
Please let me know if you have any problems.
Regards,
Rob.
[1] Currently there are not mailing list archive results being returned - this appears to be because Google has not yet re-indexed the new Sourceforge mail archives.