According to the site:
It took longer than I anticipated. Documentation is pretty darn good, but I had to work through some inconsistencies, ambiguous wording and incorrect samples. For example, the Date Type Extensions one took the longest. Documentation points to the Standard DateTime Format Strings on MSDN, but the AJAX Library does not support them all. I had to look at the source code and figure out which formats were supported. Same goes for the Number Type Extensions. I’ve made an attempt to write a clear and concise sample where one was missing.
To download your very own copy of the PDF-based cheat sheets, check out the ASP.NETResources Web site.