I just wanted to take a brief moment to tell you about a time saving tool by Project Fondue for creating sprites for your sites from a folder full of images. I was just about to start a new project in Visual Studio to merge images for sprites on one of my sites when I decided to do a quick search and ran across this nice tool.
http://spritegen.website-performance.org/
- zip your images
- choose your options(offsets, formats etc..)
- generate the css and download the image
It has a .5 mb limit on the above site, but the source is freely available for download
It sure beats rolling your own anyway 
Drew