[prayag]

As an entrepreneur, the onus does fall on you to make sure that your elevator pitch is such that any layman can understand it. Generally, the Angels are smart people and are generally quick to catch up. May be you can go with a metaphor that people understand, like you are the mint.com for really small hedge fund managers (it probably doesn't make sense but you get the idea). It's ok to be vague to get people interested and once they give you their full attention walk them through the process (but stay away from too much details, its ok to be slightly wrong than to be entirely incomprehensible).

Once the investors do their research (and they will) they will come to you with specific questions and that's the time to show the entire breadth of your knowledge and full set of features.

All from my personal experience. My $0.02.