Re: Can wordpress searcher search bbpress?
Using deep integration, if you load the WordPress search box into the header of bbPress, you can still search WordPress alone if you use something like
<form id="searchform" method="get" action="<?php echo get_settings('home'); ?>">
This way the search form is using the WordPress root directory as it’s destination rather than trying to redirect to a bbPress file.
As far as a unified search solution, the problem there really then becomes which engine do you use to display the results, WP or BBP? Either way it requires a plug-in on that relative side of the equation. It’s certainly possible, but you’re only making 50% of your audience happy at that point, because the other 50% will want it the other way.