Useful links for JavaScript and Ajax

I am going to learn AJAX. There are some useful links below:
1. The prototype lib. It is a good start to understade Ajax. The authors of 'AJAX in action' developed RICO based on prototype.
      A Chinese commont : http://forum.javaeye.com/viewtopic.php?t=14347 
      English commont: http://www.sergiopereira.com/articles/prototype.js.html
                                         https://compdoc2cn.dev.java.net/prototype/html/prototype.js.cn.html

2. It is essential for AJAX to improve programming in JavaScript.
  a. http://www.bobbyvandersluis.com/articles/goodpractices.php
  b. http://www.kryogenix.org/code/browser/aqlists/
  c. http://www.onlinetools.org/articles/unobtrusivejavascript/

3. Logging in JavaScript
   http://alistapart.textdrive.com/articles/jslogging
4.JSON-RPC-Java 和DWR比较
http://www.51cto.com/html/2005/1118/11656.htm