Dell and Futuremark are currently holding a contest to see who can achieve the highest 3DMarks with Futuremark's latest 2006 benchmarking software. Dell has a Benchmarking System with a score of 17,694 3DMarks. As of this writing, the Dell Benchmark System has been beaten:

Dell/Futuremark Performance Shootout
Name	Video Card(s)	3DMarks
David Walker	GeForce 8800 GTX	18,203 3DMarks
pcperfoldingfrog	GeForce 8800 GTS	15,327 3DMarks
Tom Phillips	GeForce 8800 GTX	14,723 3DMarks
Riley	GeForce 8800 GTX	13,313 3DMarks
Walahoshie	GeForce 8800 GTX	12,552 3DMarks
Goodmage	GeForce 7900 GTX	10,207 3DMarks
Timo Boeck	GeForce 8800 GTS	8,730 3DMarks
Ken Hiles	GeForce 7950 GX2	8,234 3DMarks
natekupp	GeForce 8800 GTS	7,993 3DMarks
pjpablojr	GeForce 7900 GT	5,642 3DMarks
Dell Benchmark XPS 710 System
CPU	Memory	Video Card(s)	3DMarks
Overclocked Core 2 Duo Extreme (Quad Core)	Overclocked 2GB DDR2 667MHz	Overclocked GeForce 8800 GTX in SLi	17,694 3DMarks

To participate, go to the Dell/Futuremark Performance Shootout web page, and sign up.

As far as DigitalDingus knows, the rules are rather loose. Just use 3DMark 2006 Free Version (or the pro version if you already purchased it). Any video card combination can be used as long as 3DMark 2006 recognizes it and logs it into the Performance Shootout database. So far, a good combination seems to be an nVidia GeForce 8800 GTX and an Intel E6700 Dual-Core processor, along with a motherboard which has respectable overclocking capabilities as well as the memory.