A new module, very easy to install and free, AJAX Header Rotator, is available here:
extensions.joomla.org
.
The developer is Fotis Evangelou, who did also AllVideos Plugin, Tabs in Content items, Content Items Fading Scroller, Ultimate Ajax Newsflash, Ultimate PNG Fix.
Yes. He has even problems with his blog, too many visitors ! I tried his header rotator. In 5 minutes, I had a full folder of images rotating in my test site, without having to code anything. Great module !