Great idea to collect useful write-ups about SM
Here's an article I found about aliasing caused by conditionals in HLSL:

http://ati.amd.com/developer/SIGGRAPH04/ShadingCourse2004_HLSL_Slides.pdf

Not the entire article is based on this, the interesting part starts from page 26
I'll try to input some SM code I've got asap

Cheers

Frazzle