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Well, for one thing, on my old PCs at home, I install a very "base" gentoo, and the install KDrive (i.e. XVesa). It runs in only about 7mb of memory as opposed to 16+ for a full X server.
However, if you want to start running apps in the XServer, you run into problems. Both firefox and opera take up about 20mb of memory. So, when running the browser, with kdrive, no window manager, and a couple other services, I'm pushing 64mb. I could get rid of some of those services, and probably will, but, all I need running under X is the browser anyway.