I would like to run something as well... I have a few options that I've been looking to do, but I'll throw out the two I'm with which I'm most comfortable.
First would be a D&D 3.5 game, bring your own characters, to give people a chance to play old characters that they rarely get to game with anymore. I have a scenario that works very well with all types of characters from a variety of levels, so pretty much anything goes character-wise, with the exception that each character must have a history, and preferably get that history to me with some notice.
Second, I am always looking to run Shadowrun, although I know its been difficult to get a game together in Vacaville. Still, its a possibility.
Also, if no one is interested in either of these options, I could run Mutants and Masterminds or even d20 Star Wars.