Latest projects are available at the main page of the device. In the wiki one can only find older projects, that still might be helpful. These projects are no longer officially supported and probably would NOT work with the latest hardware of the board.
Older projects released by Olimex for MOD-IRDA+:
1) MOD-IRDA+ and X project - download
2) MOD-IRDA+ and Debian project - download
3) MOD-IRDA+ and Python project - download