Plugin Image Optimizer
This plugin will reduce uploaded image size in wordpress.
You will also need to install Optipng , Jhead and unsafe mode php.
These tools will only strip meta information of your images, therefore the result should be lossless.
You can download this plugin here.
Yejun Web images, plugin, wordpress
Thanks for the info! This will be very helpful to all of my friends using Wordpress on my server.
If you’re on your own dedicated server, I found that running Lighttpd with future expires and gzip for static content like .css files or images (controlled through simple mod_rewrite mode R=302 redirects or manual input into your .css) lets visitors download in parallel as a sort of cheap CDN.