This site is just tons of fun, I generally play along on the fiddle. But on the few dulcimer tunes I've got up to speed, I'm hanging in there! It is a really great way to learn to play along with others, either melody or backing up with chords. The chords are right there on the page for you, but the melody you'll have to pick out by ear if you don't know the tune already.
If you happen to be on Facebook, oldtimejam.com has recently started a page there.
We bought the lifetime subscription several weeks ago and have gotten another batch of tunes since our initial purchase. Oh, and chord charts, too. It was $25 well spent in our house!