Recursos Ajax

http://miniajax.com/ - MiniAjax.com / A showroom of nice looking simple downloadable DHTML and AJAX scripts

http://ajaxrain.com/index.php?page=1&limit=30 - 1012 + Ajax/Javascript/Dhtml examples and demos to download

http://www.sergiopereira.com/articles/prototype.js.html - Using prototype.js v1.5.0

http://www.desarrolloweb.com/articulos/xajax-libreria-php.html - Xajax: Ajax para PHP