Come on up to our dojo on Dec. 4th for Bruce Bookman's Ukemi seminar. He's got a couple of videos out too, in case you want to see the break down of breakfalls.(www.tenzanaikido.com
). His method sounds similar to what Bronson described above but there's nothing like getting help from a person you trust who knows what they're doing.
Be careful and don't try to learn everything in one day!