SpritesMind.Net

I tried a couple of 32bit bmps, and got ratios between 20-80%.
for .vgm files it gives slightly better result than gzip (10-20% compression ratio).

tiles from Uwol, 16 colors :)
24,694 credits.bmp
3,481 credits.bmp.ap
24,694 finbad.bmp
1,279 finbad.bmp.ap
24,694 finend.bmp
472 finend.bmp.ap ...

this could be very interesting
compression ratio seems to float around 50% for md roms.