Also, far more minor, lack of clarity with the question Skype or XMPP => I'd just reply "XMPP" ;)
What kind of generic information would help you? We're pretty excited about graphs, social software, collaborative filtering, event coordination, behavior analysis, and collaborative editors, but would consider working on anything interesting with a realistic chance to succeed. We like iterating and letting the market guide us. These are roughly the things we agree on, and why we are considering to work together.
If you email us at founders@iter8.org we can give you more personal info.
1. How many of you are there?
2. Why are you withholding your identities?
3. Are there several organizers looking to find co-founders for several different startups, or are the organizers already committed to working together?
4. Is the point to co-found companies with the organizers or will it be setup so that any two (or three) attendees have a chance to group together?
5. Name one example of a "pretty impressive" thing that you've built. If you insist on being secretive could you give an example of a similar thing that somebody else built that was as impressive as the things on your resumes.