Here's some info, RWK
http://poisonivy.aesir.com/view/pictures.html
As for what the rash looks like, it depends on how allergic the person is and and how bad he or she's got it. This group of photo's pretty much covers it all. Some of these folks have got it to the 'just shoot me and get it over with' level. [:-]
http://www.poison-ivy.org/rash/index.htm