A marked map of the IIT campus can be found at http://www.yapcchicago.org/media/iit_campus.jpg.
Instructions for getting to IIT can be found on the conference wiki at http://www.yapcchicago.org/wiki/index.cgi in the ‘Introductory Things->Getting Here’ section.
If you have any questions, there are a few great resources that you can try:
– The conference wiki http://www.yapcchicago.org/wiki/
– IRC #yapc on irc.perl.org
– The YAPC mailing list http://mail.pm.org/mailman/listinfo/yapc
– Email josh -at- yapcchicago.org
Best of luck getting here. I hope you’re ready for a great YAPC.