It's impossible for Swiftshader 2.0 to run Crysis. This is because:
1. Swiftshader 2.0 can only emulate Shader Model 2.0
2. Crysis is using Shader Model 3.0 (even at low settings)
3. There is no way a Shader Model 2.0 emulator can emulate Shader
Model 3.0 graphics
Try the 3dAnalyze page here:
http://groups.google.com/group/intel9x-gaming/browse_thread/thread/1dab2066689de656
Seems they can get up to 25 FPS, which is pretty damn amazing.