Milan Negovan from the http://aspnetresources.com/ site has been working on putting together some really nice PDF "cheat sheets" for the client-JavaScript libraries in ASP.NET AJAX:
These are super handy pages to print out and keep around to quickly find information and code-snippets to use.
Milan is making these available completely for free - so definitely download them and send him feedback (he is going through and adding them for all the core classes in the client-side AJAX library).
Hope this helps,
Scott
