The Deutsche Forschungsgemeinschaft (DFG) has been published a report which contains overviews on the toxicological aspects of nanoparticles:

Report
Nanomaterials
Commission for the Investigation of Health Hazards of
Chemical Compounds in the Work Area
http://www.dfg.de/download/pdf/dfg_im_profil/gremien/senat/arbeitsstoffe/nanomaterials.pdf