Again, we only really do songs (ie. words and tune) though, Mr H. There are several sites holding tunes (see http://www.walshaw.plus.com/abc/tunes.html for a listing of abc collections) but most are picked up and indexed via JC's abcbot and can be found using his tune finder.
You can get sheet music online for some of the dt songs btw. Yet Another Digital Tradition offers them. Also there are the pages I knocked together while discussing the dt over here at http://www.folkinfo.org/dtdatabase1/. Both are on the Spring 2002 database though - I don't think there has been a later downloadable release yet.