Sorcha - I don't mind fiddle tunes either, although as I mentioned, there is a site (Ceolas) that cross-references those pretty thoroughly.

I am especially looking for songs. For instance, when you see an unfamiliar piece of sheetmusic, a song in an old book, or a broadsheet that says "air: Caroline of Edinborough," if you know that tune by some other, more recent name, you can sing the words right away, instead of finding someone to play it for you on the piano. I'm really wondering, however, if this information doesn't exist somewhere already. Neatly collected and bundled, just waiting for us "non-reading" folkies to stumble across it. (Fat chance!!)