What benefit does the peer reviewer gain from this activity? What are some drawbacks to peer reviewing? What other methods can you use to provide effective peer feedback?
http://www.jiskha.com/search/?cx=partner-pub-6139709814771217%3Aktl1qf7btav&cof=FORID%3A11&ie=ISO-8859-1&q=peer+reviewer&sa=SEARCH#1267
Scroll down past the ads and the first link among the search results. Read the other posts and any responses to them. You'll get plenty of ideas.