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PlayStation Portable homebrew developers pront0 and joshi have released a new homebrew application that allows users to send messages via ad-hoc. It's called PMS (stop snickering), or PSP Message Service and it's currently on its initial release version 0.1.
The application is still in its barebones phase as it doesn't have any special functions as of this writing. In this release of PMS, users can send and receive messages via pop-up window. Also included in this release is the Sony On-Screen Keyboard so it's probably easier to input text.
According to pront0, PSP Message Service will be running over the internet soon and noted that the current release runs on both PSP Slim and Fat. You can check out the download below to try the application out. Enjoy!