A friend told me about some "Heroes 3.75" and even promised to bring them... I haven't seen him for three days now, but he was very confident about it. And what is the difference between 3.58 and 3.5?
Also: when will 3.59 be released?
Besides the aforementioned official resource about WoG, you can find information here:
http://hmm3.fclan.ru/
There is also a modification of the game called TE (currently version 1.03f), most tournaments are played on it; essentially, it's SoD, but improved using WoG tools.
You can read about TE on our forum here /topic/88/, or ask your questions to one of the creators (Horn - a user of our forum!);)