What versions of Linux are you all running? I've been downloading and installing the more recent versions of Red Hat and have been noticing HUGE performance issues with each subsequent release. 7.1 ran well but every version since then has, to me, seemed incredibly resource hungry. I put them on a decent machine (500mhz, 512mb) just for test purposes and stuff was running very, very slow.
As for Longhorn I'm glad that WinFS hasn't been scrapped. That is the most fresh and innovative thing MS has done in a long while. I'm really looking forward to seeing how it is implemented.