Walkthroughs for custom maps.

1. New maps aren't being uploaded because no one is submitting them. :) I'm still waiting for Michael to provide the promised English version of "Seven Dark Souls," as translating a large amount of text from Polish is tedious, and success is unlikely without understanding what's written. Maybe I'll write in the comments section of the Polish version, and the author will respond.
2. On heroes3maps.com, there are actually about three times fewer maps than they claim (12047 maps found): they simply downloaded maps from 3 or more sites and dumped them all, without removing duplicates. This is immediately apparent if you try to find a specific map by name: you'll see three identical entries.
If you want more obscure maps, here's another site with a map catalog for "Heroes 3," but registration is required to download them. And the maps vary: from complete garbage to excellent ones.