Two separate sites combined into one search

Events happening in the community are now at Drupal community events on www.drupal.org.

Posted by dhovey on June 3, 2010 at 5:53pm

I have two separate sites that are on D5, with both using the same database (not the same tables, but the same database), and I need to combine the search results from both site indexes into the site search on each site.
Eventually, both sites will be merged into a D6 site, but for now they have to remain separate.
Anyone have any thoughts on how to approach this?