I am desperately searching for a coverage utility within mono. I have written some tests but there are most likely some parts of the code that are not excersized by my tests
You need a copy of Cecil 0.6. It is a bit harder to find as the entire Mono project has gone through a lot of changes over the past 2 years, but last I checked (10. Sept 2012) there is a copy available from the authors' personal blog here http://evain.net/blog/articles/2007/10/05/mono-cecil-0-6
You can pick the .tar.gz version for instance. Inside, there are 3 files. Put these into the monocov source directory. Run the configure script. Open the makefile and find the line saying something like "CFLAGS=-O2 -g". Append to it so it reads "CFLAGS=-O2 -g -m32". Then make.