Since we seem to be on the subject, here's my tentative storyline:
Setting: Pittsburgh, PA; same geographic location, two alternate worlds, different location, two other worlds.
Plot: the main character is an as yet unnamed computer geek who stumbles through a dimensional rift into a generic fantasy (sword and sorcery, not Elf) world. He then proceeds through between 4 and 9 worlds, picking up companions and messing up already bad situations along the way. The finale is right back here, with at least one scene involving our local RenFest, a beautiful assassin, and an object-oriented wizard...
Hmm, now that sounds interesting... Gandalf++?
Plot: A used-bookstore owner and collector of stuff discovers a book never published in his reality, and it leads him to a device that bounces him between parallel worlds until he's totally lost. Along the way he has to contend with assasins mistakenly trying to kill him, as well as the realization that what is rare and valuable in one reality may be not be rare and valuable in another reality...
Or maybe not. This plot has been playing in my head for a long time now, and I still don't know exactly where it's going...