Building a conference registration site with hotel packages

I've built registration sites for the Israel Green Building Council, Ortal Tours and the Northern District Contractors' conference. The recurring parts:

1. Attendee types and prices – members, non-members, students, speakers.
2. Hotel packages – room types, occupancy, nights and extras in the same form.
3. Payment – secure clearing, automatic invoice, email confirmation.
4. Attendee login – view and update a booking.
5. Attendee management – lists, payment status, room assignment, export.
6. Programme, speakers and sponsors.

Conference registration sites.