I know it sounds like a great idea, and I think a few people on here have tried it, but it will just add to your client side load times if it is not perfect.

I dabbled with it a bit albeit with less than ideal hardware, but a 1 gb connection, and I was not happy with the results. It worked ok with some BC content and I upgraded to a single machine before I really got to load test it with a very crowded weekend shatrath.

It is not a bad idea for consolidating everything efficiency wise if you can deal with the increased load times for those really busy areas.

By all means, if have the hardware at your disposal, test it out. Your results may differ.

Good luck.