You will find excellent information in the websites below. Please note: Some of the information is very detailed, but the details are important in determining whether these programs are appropriate for you.
IBR Info (and Public Service Loan Forgiveness) >> - Be sure to check out all the pages; has IBR calculator; FAQ page has extensive information about qualifying public service
Equal Justice Works >> - an excellent resource with checklists, webinar
finaid.org >> - A thorough discussion of IBR and PSLF; includes IBR calculator; see also link at end of section to Prof. Phil Schrag's law review article on the topic.