ABE Discussion Boards
GED/GEDi Collective Intelligence Group
There is the Minnesota Essential Skills Credential (CASAS based), which is intended for ESL learners. Check it out at www.escurriculum.spps.org.
For native English speakers and advanced/transitions level ESL learners, there is also the National Work Readiness Credential (NWRC). You can learn about that from Anne Marie Leland at DEED (sorry, I forget her email address), online at http://www.castleworldwide.com/nwrc/ or on this site by opening the St. Paul NWRC prep course, which is open to guest users.