Two World Fantasies have falled a bit out of vogue. Guardians of the Flame, Thomas Covenant Series, or the Old D&D cartoon are well known for this - People from our world go to another world, adventure ensues. I thought about such settings, especially from an Urban Fantasy point of view. I was toying with the idea, when I encountered this.http://english.bouletcorp.com/2012/12/21/war-of-the-worlds/
It soured me slightly on it. I have encountered things on the net that reworks the Fables Invasion or has the UK invade Narnia for food and resources in WWII or a cyberpunk world developing gate tech to pillage a low magic fantasy world. This cartoon is along the same lines.
Still - Modern People in a fantasy world. The juxtoposition is what makes it more interesting. Modern sensitibility in a medieval world, with occasional forays into modern tech into a lower tech world. If you can avoid the whole StarGate/ Military invasion angle, but just have it be a one way trip or only a small number able to transfer it seems interesting. Any thoughts?