My 2cents as a L1 judge as of today, although I'm likely late on it. First of all, the leaftlet looks great and much needed!
Secondly, my training was:
5% reading;
10% doing practice exames;
85% listening to Judgecast.
I would deem Judgecast worth as a resource not only to maintain knowledge but to acquire it as well, given the site even has a “become a judge” section with the podcasts most directed towards L0s.
But really, most of all, it's just 10x easier (speaking for myself) to be learning by listening to 3 L3s just being entertaining and mega informative than reading the Comp Rules or the JAR. (Sadly I couldn't find the MTR covered there yet..!)
Also, I've found this Website:
http://chat.magicjudges.org/mtgrules/, to be the fastest way to clarify rules questions, fast enough to clarify in the middle of a tournament. Could make sense to include?
Edited Paulo Azevedo (Jan. 27, 2016 10:04:30 PM)