Today giantpune has released a PSL1GHT-compatible LibPS3GUI library for PlayStation 3 developers, which includes a Connect 4 PS3 homebrew demo.
Download: LibPS3GUI Library for PS3 with Connect 4 Demo
To quote: This is a little demo for libps3gui by me. It is basically a port of libwiigui by tantric to work with psl1ght. To compile it, you need psl1ght, tiny3d, libfreetype, libvorbis, libmpg123, libaudioplayer, and libogg (this is made to work with the current versions as of 3/19/2011, but hopefully wont be broken by future versions). The connect4 engine was written by Keith Pomakis.
It is intended to be used with the cursor (press L3 and use the left analog stick to move around), but it should be mostly functional just using the d-pad.
As with libwiigui, it is licensed under GPLv2.
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