This isn't your open source pal's warm and fuzzy Ubuntu Desktop incorporating all the pretty bells and whistles. This is a lean, no-GUI, get-your-server-running-in-a-VM build. No extraneous drivers are invited to the party ... which means no SCSI drivers, so make sure you have an IDE drive on hand and available to VMware when you first fire JeOS up.
Rusty at the Linux command line? Soren Hansen and Nick Barcet moved their step-by-step tutorial to Linux Magazine earlier this year. Loyal, lively readers of that site have posted jeers, corrections, and suggestions, including strategies to shrink resulting vmdks. The community being what it is, the tutorial and all mods will eventually be posted at the Ubuntu Wiki.
A tiny-footprint server OS with minimum hardware reqs. What a novel ideal.