At
http://mycroft.mozdev.org/index.html have created a search plugin for Firefox search box. Enter in search box 'Waymarking' or follow search link.
or
http://mycroft.mozdev.org/download.html?name=waymarking&sherlock=yes&opensearch=yes&submitform=SearchThis will allow searching for categories from Navigation toolbar of Firefox and perhaps Internet Explorer 7, taking you straight to results page.
Hopefully it works ok for others.
You can create your own search plugin also at Mycroft page.
There are Geocaching search plugins there also.