I use an Acer Aspire 5101 Laptop with an AMD Turion64 processor. I have successfully installed Ubuntu v8.10/64, everything works fine including the Wifi. The exception is that Adobe Reader doesn't seem to have a 64 bit version available and the 32 bit version doesn't work on the 64 bit processor (says it's the wrong architecture), But at least we have Evince to take its place.
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