I’m running adaptive images on the site http://defylife.co.uk (wordpress as the cms)
The script is working in terms of creating images in the ai-chache folder, but it looks to me like the orginal is still being served. i.e when viewing the site, if I right-click and image and view it in the browser, I’m seeing the original rather than the one in the ai-cache folder.
The thing is, this is also the behaviour I’m seeing on the adaptive-images.com example site.
Have you checked if it really does that? I mean, it may be that when you click on the image to see it in a new window, it may serve you the original, bigger and with more resolution, but that the image served in the blog itself is the new, resized image created by the script.
Look at the properties of the image by right-clicking when your mouse is over it and check the names of the files.