For intel the Asus P4C800E-Deluxe is the best for me followed by the P4P800E-Deluxe, the difference between them is the chipset but in my own experience the performance is almost the same.
Now is avaible the P5AD2 Premium, I read that this mobo is the fastest around right now but I haven´t got the chance to check one, in my opinion the hard thing for this model is to get the parts needed to work where I live getting a PCI Express vga card and DDR2 memory is very hard not to mention the cost.
For cpu the Pemtium 4 Extreme Edition is still the fastest around and is avaible in both PGA478 (with 800 FSB) and LGA775 (with 1066 FSB).
Can´t tell about AMD but sure more users will reply giving you more options.