Right now giantpune has released a PSL1GHT-suitable LibPS3GUI library for PlayStation three developers, which incorporates a Connect 4 PS3 homebrew demo.
To quote: This is a small demo for libps3gui by me. It is fundamentally a port of libwiigui by tantric to work with psl1ght. To compile it, you need to have psl1ght, tiny3d, libfreetype, libvorbis, libmpg123, libaudioplayer, and libogg (this is made to operate with the present variations as of 3/19/2011, but hopefully wont be broken by long term versions). The connect4 engine was published by Keith Pomakis.
It is intended to be utilised with the cursor (press L3 and use the left analog stick to move close to), but it need to be mainly practical just making use of the d-pad.
As with libwiigui, it is licensed beneath GPLv2.