A slightly modified version of "bookmarks" would also be VERY useful in alleviating the "continuous mixes" problem: instead of dealing with the spaces between multiple tracks, the whole mix could be encoded as a single track (or combined into a single track) and "bookmark" indicators in the ID3v2 header could identify the track mark positions (and, presumably, associated track titles). This would also be a handy way of keeping an entire album as a single MP3 file.

On the other hand, there'd be no need for this if there were a way for the decoder to play tracks seamlessly.

-omf