Holy cow! what size pan was this in? sounds like at least 3 cheesecakes' worth of stuff.
I like tall cakes, the taller the better ! So, I use two spring form pans staked. The first pan is 10 in and the second is just a tad larger and clamps onto the rim of the bottom pan. It works out very well and provides a beautiful mushroom head for the cake.
so we're talking 20 inches vertical? sounds to me like the innnards didn't cook too well, given all that height - long way to the center and all. But apparently you've done this before so that may not be the problem.
I agree with urmaniac in that I don't think you needed that much chocolate. An egg or two less probably would have helped too.
edited to add: just realized you were probably talking about 10 inches across (duh). still, that's a pretty tall cake.
Kool Aid - Think before you drink.
I think you went overboard with the chocolate. Cut it down just to give a flavour, and some additional quality cocoa powder (like the one from Lindt) would have improved the situation.
That's what I'm thinking too. It's funny, but we have a Lindt store across the way.
What can I say? Jen says I'm trying to reinvent the wheel(evil that gurl). I just need to understand the process that people had to go through to arrive at their findings so I might understand better how to take the next step.