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I see you posted new answers here and here. Just FYI, that's really not how this site should work; the answers are really for answers, not new questions.
Based on all of your information I have several pieces of advice. First, I already mentioned you should update NITE on one of your comments. After seeing this question, I see you already did that. On Fuerte and 12.04, I just tried openni_tracker with NITE versions 1.5.2.23 and 1.5.2.21 and it worked with both. During my testing I noticed that if I run openni_tracker before starting up the Kinect/Asus with openni_launch, I get the same error you are seeing. So first hint, make sure the device is running and publishing point clouds before starting the tracker.
Second hint: based on the second comment I linked above, you are getting a bunch of ELFCLASS warnings in the output of niReg -l. This sounds to me like you installed the x64 version of NITE, but you are on an x86 system. Try installing NITE-Bin-Dev-Linux-x86-v1.5.2.23 instead.
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