https://www.google.com/#hl=en&sclient=psy-ab&q=stainless+steel+guitar+strings&oq=stainless+steel+guitar+strings&aq=f&aqi=g2g-v1g-j1&aql=&gs_sm=3&gs_upl=50777l51296l1l51542l7l6l0l0l0l5l177l815l0.6l6l0&gs_l=hp.3..0l2j0i15j0i18.50777l51296l1l51543l7l6l0l0l0l5l177l815l0j6l6l0.llsin&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=a130fa0b8cf261b2&biw=1680&bih=907

The very first link seems to have a discussion about this same topic.

Also
http://guitarstringguru.com/2010/06/stainless-steel-or-nickel-electric-guitar-strings-which-should-i-choose/
(^Shows some pros/cons summarized)
http://www.jemsite.com/forums/f30/nickel-plated-steel-vs-stainless-steel-strings-25914.html