Ajax：Yahoo!UIライブラリーやRico.jsの解説

Yahoo!UIライブラリーやRico.jsの解説が参考になる
Ajaxを勉強しよう

RICO.jsはこのサイトで知りましたが、アニメーションエフェクトなんかは結構魅力的かも。デモはこちら。

Cinematic Effects

When actions are no longer occurring just at the page level but within the page itself, more clues are          required to clue the user on what has transpired. Cinematic effects such as scaling and smooth sliding          transitions can communicate change in richer ways than traditional web applications have explored before.          Rico provides several cinematic effects as well as some simple visual style effects in a very simple interface.