Oh, I am a big fan too and I find that modded maps and such add to the re-playability of the game. I only started playing DS last year, but I think the main reason this part of gamebanshee is so quiet is because the game is fairly old (released about 5 years ago).
I belong to a couple of community sites just for Dungeon Siege and those are more active. Mostly by people who like to mod, but a few regular fans as well.
So...are you going to answer your own question with info about your character (s), favorite maps and so on?
Right now I am also playing Legends of Utrae, a really fun conversion of the multi-player map. It makes the map single player with new quests, hireable NPCs, new content and some new monsters.