Dual Computer / Intel-PowerPC Setup

Hello all,
I'm thinking of buying an Intel Mac, but I don't want to get rid of my PowerPC computer, because of all the old applications that aren't Intel compatible. My questions are:
1) How well do Intel Macs emulate with Rosetta (how much performance is lost)?
2) Can I link up an Intel/PPC configuration using Firewire Target Disk Mode?
3) Can I link up an Intel/PPC configuration, taking advantage of both processors, running at the same time, using one monitor? (basically, can I combine the two computers to make a supermachine?)
I think I had more questions... I will post them later if I remember them...

KVM = Keyboard Video Mouse. They aren't too expensive, just look for the type of ports you are going to need. For the Mac Mini's you will have to get one that uses USB ports. Something like this
http://www.bestbuy.com/site/olspage.jsp?skuId=6191569&st=KVM&lp=2&type=product&c p=1&id=1067390694346
Make sure it has USB though, Mac's don't support PS2

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