For contacting people, word gets around quickly in Arkham City when you play the game, so it will be the same.
I was being facetious with the "bat-computer or joker balloon-basket" part. I meant: What is the best way to contact you, XeroKhan, when I have questions or idea submissions I don't want other potential players to see?
As a suggestion on character stats - there are two M&M 3rd books [DC Universe Heroes and Villains, part 1 & 2] that stat out all of the Batman characters reasonably well. It may be useful, at the very least as a guideline.
Here's a decent interactive map of Arkham city to give people an idea of what is where.
[ http://www.msxbox-world.com/xbox360/gui ... index.html
Also, regarding the map - The game presents us with an open world environment, but one that really doesn't cover much ground due to the constraints of it being a video game. Are we saying that Arkham City itself is substantially larger than presented in game - which is what the game's story and the prequel/sequel comics pretty solidly establish; or are we using the game's map quite literally - meaning that there are only about 40ish buildings scattered across a 12 city block by 12 city block area, with an inaccessible 4 block security zone in the middle?
I'd be inclined to recommend approaching this problem from the perspective of the comics, and using the game as a guideline. The primary reason is that this will give you as a GM the power to create and work with more structures and environments for your plot, while keeping the general shape of the area, the big landmarks, and other interesting bits of the map exactly as they are. Secondly, its a question of believability - If the entire population of both BlackGate Prison and Arkham Asylum have been moved into the Arkham City facility, You'd need more than 12 square city blocks to house all of them. San Quentin, a real-life state prison, has an inmate population of nearly 4,000. I suggest this as a guideline for population sizing.
That leads to another question: what is the estimated size of each major gang? The comics make it look substantial, and even counting heads in-game leads me to estimate that each gang is working with at least a hundred men, if not double to triple that, to allow for guard shift changes and offensive actions against other gangs. The reason this matters to me, besides believability, is that writing about being one of a dozen men that work for a super-criminal is very different than writing about being part of a small army of criminals.
The more I think about this project, the more enthusiastic I get about it. There's serious entertainment potential here. Thanks again for putting this together.