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Server is free. http://www.vmware.com/products/server/ -- Mac vmware fusion still costs, though.

And what about Sun's VirtualBox? It's free and pretty good from what I hear.

$30 for as many machines as you own, work or personal, for your own individual use.

Probably the best $30 I ever spent on software, given how many many times I use it per day.

Oh. I meant VMWare Workstation. (upading the post now.) And Beyond Compare is shareware, isn't it?

VMware Server (formerly GSX) is actually free as well.