The IR board manual is still on the FIRST website, there are no links to it anywhere I can find. The URL on the card that came with the board still works, and the page has a link to the IR board manual. I just happen to have that card in my pocket, so…
www.usfirst.org/frc_decgift
Direct link to the PDF:
http://www.usfirst.org/uploadedFiles/Community/FRC/FRC_Documents_and_Updates/2008_Assets/FIRSTIR%20-%20Instructions%20_121007.pdf