Jean, everyone,
I think FPGA4Fun [which is an amazing site, as we all know] should have a prominent link/section for submitting worthwhile websites and PDFs. There are TONS of PDF tutorials out there, but they can be pretty hard to find [sticking to the .edu domain can help]. I stumbled upon a really great site from MiT. It's the course site for their 6.111 "Introductory Digital Systems Laboratory" and is absolutely worth linking to.
http://web.mit.edu/6.111/www/s2006/
Of particular interest to me was the guide for adding block ram with coregen.
http://web.mit.edu/6.111/www/s2006/LECTURES/ramrom.pdf
Having a user updatable section [maybe Wiki-like] is likely the best bet for having a lot of content and hopefully good for organization [as anyone can change things]
what say thee?
-andrew