pretty damn hard. I'm still trying to grasp it WITH the book. It'd be near impossible to play an incarnum based char. w/o access to the book or PDF.
If enough people are interested though, this DOES look like a lot of fun.
How about a small campaign? A bunch of adventurers shrunk down by a magical experiment gone awry to Fine size, say, a la 'Honey, I Shrunk the Kids', and questing to save the world, or perhaps just return to their original state.
I have an interest in playying or perhaps even running an Urban Arcana game based loosely on the Buffy/Angel series. I DM'd a live campaign over the summer and found it somewhat enjoyable.
I also have the rulebooks for Unearthed Arcana and Blue Rose I am looking to try out.
And, I have an itch to play a superhero/X-Men style adventure, but with a cast of characters and plots more like Mystery Men. I already have several NPCs in mind for this type of game, since my players have all gone away.
Of course, I've never run a PbP game before, so I'd have no clue how to even get one started, though I have read several PbP "how-to" websites before.