While perusing the main LilyPond website, in the announcements section, I only just discovered the online software Scorio that acts as a GUI front end to LilyPond 2.16. Does anyone on this list actually use it? I don't think I ever will for a number of reasons, but I was just curious if anyone else does.
It looks like they use MusicXML as their main data format then process it into LilyPond syntax for engraving on their server. Maybe we could work with them to leverage their converter if it works well.