Particles seem to be in the air.
Wondertouch will finally release an After Effects version of particleIllusion, which they'll show at NAB 2009. Also showing at NAB is version 2 of Trapcode Particular, which is the current particle system of choice for AE users.
Studio Daily posted a video by Harry Frank on Particle Orientation in Trapcode Particular, where he "demonstrates how to get around the particle orientation limitation in Trapcode Particular wherein particles always face the camera. Using camera trickery and expression magic you can see the particles at an angle."
It's hard to tell if this is another part of Frank's bundle Complete Training for Trapcode Particular. Anyway, Studio Daily has 2 more video demos on Particular from that training set on Layer Grid Emitters and Advanced Physics.
And if you can't get enough of particles, check out 15 Inspiring Particle-Based Tutorials from Around the Web at AETUTS and the recent lovely additions to the Trapcode Gallery (see picture above).
Update: In Better Compositing with Particles Aharon Rabinowitz uses Particular to show "you a technique for placing layers inside the middle of a particle system - crucial to truly integrating your CGI effects with your live action footage or motion graphics."