I'll give you any one of 3 or 4 ideas right now, if you want them. They're ideas I'd develop if I had the time, energy and brainpower. I've got personal connections for you too, if you want them, people who need the product. I won't even ask 50%, heck, 5% sounds fine by me.

My experience has been that, while that is useful, it's by no means sufficient to lead to a complete and useful tool. But I'd absolutely take that deal any day of the week, from the "idea" side of the fence. Imagine if you did it 20 times - quite a nice portfolio.