<a href="http://rushi.wordpress.com/2006/04/04/beginning-ajax/">AJAX Resources for beginners</a> - for when I'm tired of using ready-to-use libraries and want to build it myself.
<a href="http://particletree.com/features/the-hows-and-whys-of-degradable-ajax/">The Hows and Whys of Degradable Ajax</a> - because everything with Ajax should still work without Ajax.
<a href="http://elliottback.com/wp/archives/2006/04/16/top-10-best-designed-blogs/">Top Ten Best Designed Weblogs</a> - great for inspiration