I've used rambunctious fo r years on several versions of OSX. I think the app is Great.
However, I haven't gotten it to work on Panther, OSX.3. It does make a "misterious" disk that shows up in Disk Utility, but it doesn't show up in the Finder. The only way I know of getting rid of it is to reboot.
ramBunctious X
RAM disk customized for desired speed, security.
Version: 2.0.1