Some sample links
http://mirlyn.lib.umich.edu/cgi-bin/api/basic.json/isbn/0966010612
http://mirlyn.lib.umich.edu/cgi-bin/api/basic.xml/isbn/0966010612
http://mirlyn.lib.umich.edu/cgi-bin/api/marc.json/isbn/0966010612
http://mirlyn.lib.umich.edu/cgi-bin/api/marc.xml/isbn/0966010612
http://mirlyn.lib.umich.edu/cgi-bin/api/circstatus.json/isbn/0966010612
http://mirlyn.lib.umich.edu/cgi-bin/api/circstatus.xml/isbn/0966010612
Some sample pages
PoCOPAC 0.6
Simple, slow sample
Slightly less-slow sample