I've been mainly contributing to Wikipedia so far, but this site looks promising for more in-depth Amstrad (or Schneider if you're German) information.
When I'm not here or on Wikipedia, I also like to work on [http://rosettacode.org/wiki/Category:Locomotive_Basic Locomotive BASIC programs] over at the Rosetta Code wiki.
e-mail: mdoege?/\ compuserve\/ com