SuperSponge Soundfont (PS1) Alpha v0.4
This still isn't complete, but seeing as how I've been dragging my feet when it comes to finally getting back to work, I've decided I might as well upload what I've programmed in thus far, at least.
The percussion preset is incomplete, but all the essentials are there (assuming you don't count things like the annoying Fairy Twinkle as essential), plus a few extras. There are a good 45 presets already. Some of them sound kind of crappy (particularly some of the accordion/reed organ type instruments) but the soundfont as a whole is at least functional enough to be published in its current state (so that people looking for it won't continue to be disappointed).