Incorporate Multiple WordPress Blogs in One

I currently run a guild website that is fixing to expand into other games (e.g. World of Warcraft, Age of Conan, Warhammer, etc.) and the idea I had was to have a “main” website about the history and general information of the guild and then have separate “templates” for each game. What I was wanting to do is have each respected “template” website pull news from the respected games, but the main website pull postings from all of the game website into a single “blog”.

How can I do this without having to manually import new postings from each blog?

What I’ve tried thus far is a theme switcher, but I am not sure if it will give me the control I want for each “template” (e.g. different side bars, etc.) and I am trying to steer away from multiple installations if I can, but am not opposed to it.