The search in WB2.7 is pretty easy to use. It is nothing else than creating a search.php in the module directory.
Unfortunately there is no English (or French) manual. Just the
German FAQ on thorn's website.
Basically you do not install anything in the search table anymore.
Create a function with the name
your_module_search().
In there you can get info and variables from the search engine. Next you can decide what data will be available to be found by the search function, and you return that data in the defined array.
The manual page is translated pretty good by
Google. That might help a bit.
You could also have a look at the search.php in my
Multipart page module to see another example.
Ruud