I've just bought a Celeron D 2.8ghz at PC World (buying online causes delivery problems) for ~£80, the equiv P4 is ~£150, so I read that review with trepidation, however I think it will fine for a File Server/Domain Controller.
I do feel that as most of us move towards a multi-machine setup, that there needs to be a bit more focus on cheap-workhorse components, as not all the machines we own need to be top end gaming rigs. A lot of hardware sites forget that.
-Jar.
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It's a Dawg Eat Dawg World.
http://www.Jaruzel.com/mud