Over the last couple of weeks I have been writing an app to allow users to download and install tracks for the game gripshift using only their PSP. and today I am releasing the first complete(for now) version. The download also includes Fanjita's latest EBOOT loader. Just unzip to the root of your Memstick.
Further information can be found on my website here
Here's a screenshot of the app running (background image has changed slightly)