Aside from Go Fish, it looks like dsi has also been busy with work on PSP Memory Game.

The developer dropped by the QJ.NET PSP Development forums earlier to release this game's version 1.1, now built to work on PSP Slims. dsi notes this was made possible thanks to homemister91's new Slim-compatible LUA Player. As for the rest of the changelog:

* new fonts
* loading screen shown at start
* some aesthetic changes
* improved random number seed; games were getting predictable
* works on PSP Slim now (thanks to homemister91's new LuaPlayer HM)

Installation instructions and the rest of the PSP Memory Game's changelog is available in the file bundle's readme. You may also want to visit dsi's thread at the QJ.NET PSP Development Forums to leave your feedback.