I just put ep.binSpat~ (version 0.16) online and on www.maxobjects.com.
Version 0.16 is an update from an older version I put online some month ago.
Comments and reactions are very welcome.
underneath is the readme-file.

Have a nice day.
Edo Paulus.

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readme

ep.binSpat~
version 0.16 29-03-2006

ep.binSpat~ is an msp object (abstraction) that handles binaural spatialization for use with headphones through the use of hrtf’s. It can virtualy position a monoaural source on a horizontal plane 360 degrees around the listeners head by dynamic control of two parameters: direction and distance. It doesn’t control vertical positioning.

Thanx to soundHack for sampling the HRIR’s.
Some theory info: http://interface.cipic.ucdavis.edu/CIL_tutorial/3D_HRTF/3D_HRTF.htm
Only tested on OSX 10.4.4 with MaxMSP version 4.5.6. Heard from others that it works on OS9 and Windows XP too, though.

download at http://www.eude.nl/maxmsp
please send comments/reactions to: edo@eude.nl

Edo Paulus.

Also: no garantees or anything, use at own risk.
version info:
version 0.15: less cpu-intensive.
version 0.12: first version.
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  E d o   P a u l u s

  sound-installations, generative music, performances.

  URL: http://eude.nl