You can also get hold of Dremscape's DATs over at http://www.emuxhaven.net/~metroid/index.html
- look in the Custom section.
Be warned though, they are a bit of a hotch-potch of formats etc. Or should I say were
a bit....they've been updated since I last looked so I've no idea if they're structured better or not now.
CD32/TV DAT's is something I keep thinking about but never seem to do anything about...