by the big duplication with all the different versions of the same code.
I'm relatively good at search engine optimization (no, not the buzzwords business but the server technical side) because of customer demand (sites with sometimes > 10,000 pages). Could you/Phillippe post some example URLs of contents which ought to be indexed. Can give it a try and report what I find.
http://www.squeaksource.com/robots.txt http://www.squeaksource.com/sitemap.xml.gz
Note that the directory listing produces a slightly different result when being visited by a GoogleBot.
Lukas