Christian,
Just for fun I compiled cudaminer with the 6.0 toolkit,
which I was able to do by changing some of the deprecated > compute 20 sm20 to 30 in the project file, but it would only hash at 60% -70% or so of the 5.5 toolkit. Just tried it for fun; it will compile, but will need some definite tweaking.
Whoops helps to make it compile x64 code on an x64 system; anyway still only about 60% hash power with the 6.0 toolkit.
(Compiles normally with 5.5 of course.

)