<p>I know there are already a few questions regarding recommendations for C++ unit test frameworks, but all the answers did not help as they just recommend one of the frameworks but do not provide any information about a (feature) comparison.</p>

<p>I think the most interesting frameworks are CppUnit, Boost and the new Google testing framework. Has anybody done any comparison yet?</p>

See this question
for some discussion.
They recommend the articles:
Exploring the C++ Unit Testing Framework Jungle
, By Noel Llopis. 
And the more recent:
C++ Test Unit Frameworks
I have not found an article that compares googletest to the other frameworks yet.