take a look at Tabledit -
This is really helpful for me and there are a lot of really cool .tef files around the net.
I saw a web posting on foreign language learning - it said some folks do better if they first understand basic grammar and others do better just working out new phrases. Since I'm a gotta know the grammar rules type, tabledit works for me. Others may get more just by listening and trying to duplicate the sound.
Try the old Jim Kweskin records, especially Relax Your Mind - out on cd.
Also, I recommend Grossman's books on Mississippi John - I've been working on Satisfied and Tickled Too - can't beat that for fun, IMHO.