This plugin adds up to four new buttons / links to the WordPress Editor panel. You can select to add a quicktag to easily insert: 
Amazon item links 
Amazon product searches 
custom span class 
custom div class
The settings pane allows you to enter defaults, as well as your own Amazon associate ID.

David’s Ultra Quicktags

Adds new buttons to the Editor window (Amazon Links, Amazon Search, etc.).

tnorberg

This a basic quicktag addition for “two” quicktags that I needed for my plugin and then some. But anyway its a html encoder and an easier way to generate shortcode for my MP3 Player Plugin for WordPress.

My Quicktags

This plugin generates two quicktags on the post/page editors. One is the easy html encoder and the other is the easy mp3 code embed tag.

David’s Ultra Quicktags vs My Quicktags