A new version of OpenMx is out; this time it comes with mixture distribution, according to this announcement. I can't wait to test the new features out!

With help from Michael Spiegel, the lead developer of OpenMX, I was able to get it compiled and installed on my 64-bit Ubuntu system. Now it runs beautifully.

Looks promising: http://openmx.psyc.virginia.edu/Right now it cannot be build from source because there are some comparabilities between OpenMx and R 2.10.0, but I assume this will be resolved soon.And the development seems to be quite active.