Crowd simulations would be nice to have inside houdini (something which could make possible to create people fight, cars traffic, air planes traffic, birds, flies, boats etc. - Sure this is already possible but could there be some real tool for this purpose in future. It would be very nice to have something similar than

MiArmy - http://www.basefount.com/miarmy/features [basefount.com]

These are pretty cool features:
Contact and Pin to kinematic object
Contact and Pin to other agent
Terrain Color Placement
flow field, force and fluid field,
Actions, Action Editor, Transition Map, Blending,
Miarmy Traffic Solution
Miarmy Battle Solution
Formation 2D/3D Control

or Golaem simulation http://www.golaem.com/ [golaem.com]

Btw. Have you seen this: http://youtu.be/pqBSNAOsMDc [youtu.be] Looks cool.
Here is more info: http://gamma.cs.unc.edu/DenseCrowds/ [gamma.cs.unc.edu]

-Kind Regards, Jumaku

well sadly there is not a build in crowd simulation system but there is a tutorial for how to build one:

https://vimeo.com/53087785 [vimeo.com]

https://vimeo.com/frading/videos/page:2/sort:date [vimeo.com]

its easy to implement, the problem is that most of the studio create their rigs in maya.

if the rig is done in houdini, is very easy to bring the animation curve information into a point and then use that as an agent for rendering.