Just a quick posts with some additional info to Zidanes doc, for anyone who may be interested.
Some additional 0xdb datatypes:
0x00, I don't know what's in here actually, but it does exsist!
0x06 is text (for dialogs etc), one byte per char with one special char (off the top of my head, 0xfe, but I have to look that one up) for special commands (ie. get image, get character name, get name of character is slot x, etc)
0x07 is sequencer data, in other words: music
0x08 is sound related, I'm not quite sure about this one but I think it's only calls, like calling a sound effect/sound effect bank
0x09 audio
0x10 is stats for enemies (ie. name, hp/mp, weaknesses, names of attacks etc)
0x14 is image mapping
That's all I can remember for now.