Hmm, dual Pentiums, should be on eBay. As for Dual Pentium 4, no, Intel decided from now on only Xeons would go dual.
To tell you the truth, there's 0 difference between a 512k P4 and a 512k Xeon core. Intel waited until recently to move Xeons to a higher bus speed however.
You'd probably get better performance from two Opterons. Someone's making a dual-opeteron board with an nForce3 chipset now, so you don't even have to stoop as low as VIA chipsets to build it.
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