With the Dual 800's trickling out, a lot of people are looking for benchmarks. I've got mine sitting here, so if there are any requests for Benchmarks, let me know -- with specific links to the requested software in question.
Config:
Dual 800/G4
512 CL2 RAM
Superdrive
GeForce3 AGP (1st monitor)
ATI Rage Pro PCI (2nd monitor)
Current Benchmarks:
Ars Technica SMP Benchmark
Cinebench 2000 V1.0
Ars Technica CPU Benchmark
G4 TimeDemo
Seti@Home
RC5
iTunes
see comments for results