Hey Frank, looks quite nice. I work for a company which does site search, so I understand how difficult this sort of thing can be to do right. The results appear to be relevant, which is good.. were I to put on my critical hat I guess I could note a few things that strike me about it.
- the categories selection box seems to be a bit of a waste of time for this site, which is not a reflection of the search, but that the niche of this site is already so focussed that just about every result will be in one category (if they are categorized at all). I assume this is a reflection of this being just a site restrict on a much wider search.
- the google ads seem well placed, they are not too invasive - I hope you are getting a cut ?
- I changed the 'In:' setting to 'my threads' and it then required login to boardtracker - I wasn't too sure what was happening there, I guess I was being a bit optimistic and was hoping that it would somehow have been passed by messing-about id and would be able to restrict the result set to the threads that I have contributed too.
- it is nice that it lists the number of views and replies in each entry - may be interesting to be able to order by that ? though I guess you should get that effect a little with the relevancy as a thread with many entries should have more matches to the search word (assuming it comes up periodically)
Sorry if I sound like I am being picky - you did ask

It does seem better than the old one though - thanks.
Wayne