Though in a rough form, we have set up a wiki that will undoubtedly answer many of your questions. It is available at http:/wiki.scalr.net.
Worth taking a look at is the Getting Started guide that explains the concepts behind Scalr’s scaling methodology, and gets you up and running fast.
If there is anything missing, send me an email at sebastian@scalr.net to let me know, or better yet, add it to the wiki!