Well, I have released the expansion for Nuclear Renaissance called The Tome of Tridlins. Its got loads of stuff in it and basically "finishes off" the game. Its the campaign rules, plus massively expanded options list. Its got rules for pretty much every kind of gang you might want to play. Zombies, mutants, animals, robots, military gangs etc etc.
The thing that makes it different from other games (the USP) is that its build around playing with more than two players. Its works fine with anything from 2 to 10 players at a time. This coupled with the extensive gangs deign rules means its great for club play!
There is more detailed blurb in the shop entry. The best value option is the £30 combo deal, which gets printed copies of the rule book and the expansion, plus 5 figures of your choice:
http://shop.ramshacklegames.co.uk/index.php?main_page=product_info&cPath=5&products_id=453
And the cheap option is the electronic option. The core rules are free and the Tome of Tridlins is £5:
http://shop.ramshacklegames.co.uk/index.php?main_page=product_info&cPath=5&products_id=455