Andrew Kramer has a technique for generating shadows for Trapcode Particular.
Watch his awesome tutorial here.
Quba has made this tutorial on how to create accurate reflections in AE. It is surprisingly simple! And it works for the camera-aware Trapcode plugs such as Particular, Lux and 3D Stroke. Check it out here:
With this set up you are able to dynamically make a ribbion or wire as long or as short as you like. You are also able to attach anything you like to the two Nulls at either ends of the rope. This allows you to link objects to the wire very easily. And because it is done using Particular the wire can be moved in 3D space.
You can grab the file here: http://hypoly.com/downloads/3d-ribbon/
Awesome tutorial by Andrew Kramer that shows how to create realistic smoke trails using Trapcode Particular: http://www.videocopilot.net/tutorials/smoke_trails/