Just remember that only multi-threaded applications and true multi-tasking environments benefit from multiple processors. I was dissapointed when I got a dual CPU motherboard and found this out.
If you are a high end workstation user who has to render or compile while working with other applications you might benefit. If you are a gamer and you play only quake3 all of the time, you might benefit, If not the cost of the Board and the second processor will probably not be justified. I thought it sounded like a great idea until I tried it. If you are a gamer the best thing you could do is spend double the money on a **** hot athlon or one of the new thunderbird processors.