Hi,
I just found a recording of the talk about cmake at FOSDEM 2009. I was
at this presentation and it helped me a lot understanding how to use it.

... and now just weeks later I can fumble around with our cmake.bbclass
and add a recipe that is using it (llvm 2.5).

Highly recommended:
http://free-electrons.com/pub/video/2009/fosdem/fosdem2009-neundorf-cmake.ogv

Regards
Robert