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Just recently, we have received a tip that a member of the community at pspsource.de named Kididio has written an application called "PSPik" which, via the PSP's IR port, basically allows your PSP to receive information from your IR keyboard.
A video clip has been provided which shows this application in action, but we have been told that the app has not yet been publicly released, and its current version is still unclear. In the meantime, we shall be treating this video clip as a Proof of Concept and we'll also be eagerly keeping watch to see if this ever gets released. We will ofcourse keep everyone posted once that does happen.
In the meantime and just in case you can read German, you can view the original thread here tell us what you make of it.