For those of you who do not know of Mark Hanson's website - Mark has on it a bunch of very nice TABS in pdf, a couple in slack key style Beautiful work -- mahalo nui, Mark --
There are two sets of TABS with wonderful excercises for developing greater independence and facility for the alternating thumb. Though in standard tuning, these are worth working through. They are taken from Mark's very good book "The Art of Solo Fingerpicking."