Frank J. Hoose, Jr.'s site also has one of the best collections of information about the mini mill. He has a very good comparison of the different versions of the mini mill. Frank has some "Premium Content" on his site for which you must subscribe. It is well worth what it costs; we recommend it.
This group is dedicated to the discussion, use, toolmaking, and ranting about the mini mill sold by Grizzly Industrial and Harbor Freight. The group is just getting started, so keep an eye on it as it grows.