Wow, this month went fast! I was extremely busy getting everything sorted out for college and finishing up my classes, but now I have the next 6 months free.
Firstly, I managed to get my hands on the Gameboy image quantizer, shown here. I got a copy from someone who managed to download it in the 6 or so weeks it was available at the link on that page. You can find a working download link here.
I decided to take apart my Propeller-powered ROM reader, and rebuild it with an ARM7 cortex-m3, which I'm hoping will make it cost less in the end and give me a chance to brush up on C.
Also, I WILL be making a Gameboy programming tutorial over the next 3 months, which will include code snippets for the various parts of the Gameboy (for example, the LCD initialization code, reading buttons, etc etc).
On a final note, I would like to get an idea of how many people would buy a USB Gameboy cartridge reader/writer for around $30. Just leave a comment or email me -- that way, I can get an idea of if this is worth taking my time to make into a product.