website performance tuning

charlesproxy and/or fiddler for acting as proxies

firebug

yslow

google page speed: Help to find unused css

http://spritegen.website-performance.org/section/what-are-css-sprites

Update 2010 11

Start experimenting with

End-to-end real-world web page instrumentation and measurement suite: http://code.google.com/p/jiffy-web/

mod_pagespeed: Not yet usefull at windows servers but can use instrumenation ideas.  These blocks measure the time the client spends loading and rendering the page, and report that measurement back to the server.  See http://code.google.com/intl/de-DE/speed/page-speed/

http://spriteme.org/  Live website sprite generator + CSS

http://www.stevesouders.com/blog/2011/02/16/jdrop-json-in-the-cloud/

http://stevesouders.com/mobileperf/mobileperfbkm.php

HTML/JS/CSS Optimization:

http://csstidy.sourceforge.net/ Optimze your CSS