Common font file MAC/PC

What is the best way to set up a common font folder on an NT network that consists of MAC, PC and Unix machines? We have a post production house that uses all three of these formates for different types of editing. We now have islands throughout our facility and passing a project around requires finding the last user and aquiring/converting their font. We are using Suitecase and ATM (soon to standardize to Suitecase as soon as NT ver. released) to pull from our font files. What is the mostuniversal fornt format? Post script/Truetype .... What is the best Font converter on the market that's easy to use and converts the most types of fonts?