Custom Tools how to

Please, please, someone make explanation tutorials on the tools covered in shadows the most:
Custom Tool
Custom Vertex
Custom Filter
Particle Custom Force
Particle Custom
I've seen a couple tutorials on a couple those, but that's like what, a 1 % of their all capabilities were discussed?
Is there any math veterans to show us some high voltage tricks with those and an explanation and application to the real shots?
Also, Simple expressions, too little is explained in the manual.

That would be very very nice, thank you.

It would be virtually impossible to cover all of their capabilities. It's really limited only by your ingenuity. That said, I've done a little bit:

Blackmagic Fusion: Expressions
Soft-Skinned 3D geometry
Linking 3D Geometry to Particles
Pin Light Blend Mode

That's everything I can recall writing. At least, everything that's available to the public. I've got some stuff on the Muse internal wiki that I should repeat on my blog eventually.

I recall seeing an interesting video about pCustom for motion graphics. There are also some interesting applications of custom tools in several macros available at We Suck Less. For instance, SecondMan_Yankee is cool.

edit: Made nicer links.

Thank you!