I, for one, have been desperately waiting for a scalable 64-bit platform to hit the market that didn't cost a fortune. There are plenty of applications that can use it, though most casual business apps don't need it.
Right now I have one choice: Linux/BSD on AMD Opteron. Soon, I will have a second choice: BSD on IBM PPC970 (aka OSX). This is a good thing. Since I already have a dual proc G4-533, this latter is an attractive option. Apple's OSX puts a very tight front-end on the positively golden FreeBSD backend. Given BSD or Linux, I would prefer BSD anyway for the OS.