One Image web page
This is a tool for web masters to convert their web page from many separate images into a web page with one image. If your web page is slow and it says "(xx items remaining)" in the status bar a lot this will reduce the number of items the page needs to download.
The separate images are put into one image and the tag is changed from
<img src='xxx.png' />
<img class='oneimage_MainPage_1' src='img/blank.gif' />
Sourceforge project page