The midi plugin is great! I'm a little sad that it is only a softsynth, since I'm sure my expensive hardware would make it sound better...
Anyway, I'm not entirely sure why, but playing midi files in winamp sounds different - better in general. I think it's due to winamp having hardware support, but I can't confirm or deny that.
Thirdly, the first line of any text data in the midi file is considered to be the title of the song, which is not always the case - sometimes it's blank or the name of an instrument. Mods have the same problem. Is it possible to have separate title display options for midi, mod and wav based files?