My pet project is on pgFoundry. pgswish allows integration of search results from swish-e index and structured data from PostgreSQL. It's a function which returns multi-row data in PostgreSQL which is swish-e search result.
However, I also posted e-mail message to swish-e mail list and Bill Moseley had some great comments. If you know how to write PostgreSQL C-functions I would be great-full for another pair of eyes on this project. My C is rusty.