Awesome. While you're at it, add a date range filter. Also, can you set up a search engine for replies, as well-- using text from the reply or author (screenname) or date range or all or some of those (like they have at other message boards)?
Date range - no problem. The replies might be more problematic, as this is a sense-based engine and the entire article with replies gets shrunk down to 150 bytes or so (that's what makes it so stinking fast). Although, if John feels like integrating, I could extend it to do searches like "where did member X post about subject Y?"