<snip cool stuff about very slick new search functions>
So... still no category intersections? I'm merrily deveoping my CLucene daemon, whether that ever ends up being of any use to Wikimedia or not... (what are we using now, a GCJ'ed Lucene?) but I'm still a huge fan of category intersections - and I think lots of other folks are too... all it takes is another lucene index with an appropriate analyzer :-)
Here's an argument for both a) category intersections and b) an inclusive policy with regards to articles/content:
The other day I was looking for video games to play with my kids, age 6 and 8. So I was looking for rmultiplayer games on a PC platform and after visiting a few review websites, googling around, and ending up at a Wikipedia article, I had an idea: I can do category intersections to look for the games.
And what do you know? http://aerik.com/cl_search.php?q=%2BMultiplayer_online_games+%2BWindows_game...
With an inclusive article policy and more categories (tagging), it becomes much more powerful... not just for video games, but for anything...
Best Regards, Aerik