ESHENSH  Creat RAM Disk is really easy on OS 8/9 because it's a build-in function. But it's NOT build-in on OS X.

It's not easy to make and manage multi RAM Disk, even on OS 8/9. And it may something wrong when RAM Disks full but programs still try to write into it.(Such as Safari, if its cache has no free space, Safari will use almost 100% CPU, and system become hang.)

RAM-Disk Utility is my answer for RAM Disk Usage.

Configure many RAM Disk's setting, and create,remove,automate with those setting.  
(Version 1.1)