Sometimes as a GM I get the itch to run a different game or system. It doesn't mean I am done with the current game I am running - far from it in this case really - just that I want to run something else too. As a story teller this doesn't surprise me. Different games emphasize different themes and mechanics encourage the story to go different ways. Even if I just used two different systems to run very similar games for similar characters the story could end up vastly different because of those system and thematic differences.
So what do I want to run? Well, lots of things really. The two big ones that currently have me are a Star Wars campaign, which is really one of two campaigns depending on how you look at it. The first being kind of like a Shadowrun game just in the Outer Rim of Star Wars, which is pretty much what Edge of the Empire is about, and the second being a Rebellion based game. The second game is a Robotech game. I've liked Robotech since being a young child, I like the "war/space opera" feel of the story, and I like that there is room for both pilots and non-pilots alike in it.
Now the big problem is that time is limited and I'm already pretty much at capacity for games. The one night I GM I run an L5R game that I don't ant to end because I really like it, and we more or less just sarted the current geeration/era story arc.
Still, given infinite time there are a lot more games I'd love to run. How about you?