If you can provide the error output when you try and import psutil that would help, as well as letting us know what version of FreeBSD and psutil you're using. Importing _psutil_bsd isn't the correct way to use the module, that's an internal module for psutil that contains platform-specific implementations of internal methods.
I believe there was at least one recent patch for FreeBSD so you may want to take a look at the recent issue reports on the Google Code tracker too.
-Jay
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