Using Thiruvalluvan's advice here: http://search-hadoop.com/m/FRN3Z1H1vKv1&subj=RE+How+to+build+Avro+C+lib+for+Windows
I was able to create a Visual Studio 2010 project for Avro C++ 1.5.4 You can find it here http://www.assembla.com/code/avro-cpp-windows/subversion/nodes along with patches for svn repo. Perhaps someone with a little more cmake experience could use these changes and get the cmake build working in windows. -- Matt Stevenson.
