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I WAS using an old IBM all-in-one machine, few years old. I forget what they were called. They looked sort of like en evil iMac. It was a good machine, I ended up dishing it off to a friend who needed a computer.
I ran NetBSD and PC-BSD on it. I actually preferred NetBSD, but I had a heck of a time trying to get VPN to work, so I used PC-BSD for work, NetBSD to play. I found NetBSD to be more responsive, but that was pre-1.0 PC-BSD.
Now I am using an intel mac mini, modified a little, 2.33 core 2 duo, 160 gb disk, 2 gb ram... running leopard. Fun stuff!
I have to say that Leopard has made a difference in regards to networking and CPU-intensive programs (over Tiger). Networking seems snappier and more consistent/resilient (especially VPN - which worked poorly, dropping connections frequently, taking 3 or 4 tries to connect - I get in first try and the speed of the connection is obviously (tho' not numerically proven) better w/ Leopard).