I know you've mentioned it before, are you using it in a production environment? I've been spending the last few weeks getting acquainted with VMware's ESX and the really cool features all require a SAN or an NFS share. A SAN seems to be Out Of Our Price Range, but openfiler would definitely come in under budget.

On the home front, I'm very happy with my ReadyNAS. I bought 1.5TB drives as soon as they were released, and they made a beta firmware update that week to make it work, and released the final version it shortly thereafter. Well worth the premium over a buffalo or the like for the service alone.