If you have a resource to add, feel free to do so or send it to me at jwilker@u.washington.edu

ENVIPOLCON
investigates degree of environmental policy convergences across european nations. 2003-2006. among other things includes very detailed data on  different forms of environmental compliance

EUProfiler
on-line self placement tool for all european parties. based on expert assessments. one of the most interesting features is that it rates parties not only by issue position but also by "issue salience." I asked and the data are supposed to be released in 2010 (cross fingers!)