Unigine released version 1.1 of their Tropics demo, new in this version is the addition of DirectX 10.1 support. You can download it over here, it features some pretty sweet graphics. This benchmark uses the Unigine engine.
Support of DirectX 10.1 multisampling features
Multisampled deferred buffer, which allows combination of light scattering with anti-aliasing
Pixel Shader Model 3.0 support is required now, so minimal supported hardware is ATI Radeon X1xxx / NVIDIA GeForce 6xxx