Developer Matt Neuberg has a new version of his MemoryStick utility available.
MemoryStick provides a graphical display of your physical RAM usage under Mac OS X. This new version adds an indication of how many swapfiles you have, and a Dock icon that graphs RAM usage dynamically so you don’t need MemoryStick’s windows. Plus, all colors are now user-configurable, according to MacTech magazine .
Memory stick is freeware and a 144K download.