Its a bit dissappointing that the Nucleus solver (nCloth / nParticles) in Maya09 has very limited API access and thus I have trying to learn the anatomy of a solver - particles , springs, methods of integration et al - and these are very good references with source code:

memo : uses verlet integration
Traer : Runge kutte and Euler integration
toxi: verlet
Zach lieberman: Introduction to basic principles and hardware connections.

Many thanks to the good people who have give out source code!