Here's a direct quote from Mark Hanson's book:

Open E tuning (EBeg#be', low to high).... has the same relationships string to string as open D, but is tuned a whole-step higher. This puts additional stress on the guitar (three strings are tuned higher than standard), and produces a brighter sound. But it may not be advisable for your particular instrument. If you need to play in open E, consider tuning to open D and placing a capo at the second fret.

Given Hanson's comment, I would not be surprised if there is very little instructional material on open E tuning available. I would concentrate my search on open D tuning. And don't ignore open G. Even if you don't like the sound of open G (or open C) remember that an open G tune can be made into an open D tune just by moving all the fingerings one string toward the bass side of the guitar.

Bruce