Here's the site of the guy that 'invented' the IRMAN (he calls it Universal Infrared Receiver but sells the fully assembled unit as the IRMAN).
There you can get the software, schematic and parts list.
BTW, I sell a nearly complete parts 'package' which includes all parts (pc board etched and drilled, DB9 connector, all resistors, diodes, IC socket and IR module). The only thing you have to get is a programmed chip (I cannot supply that due to copyright agreement with the author). The package is 1/3 the price of the assembled IRMAN. One place you can order all the parts.