The PyCon organizers are trying something new for PyCon 2010: posters. Basically there is a plenary session where people have posters about something and they stand there talking to whomever comes by (if you have been in academia you know what these can be like). In my time doing posters at academic conferences I have found that at the larger conferences a poster can be worth your time. You end up with enough people coming by talking to you that you get valuable feedback and contacts. Plus a poster is a lot less stressful to do compared to a full talk and allows for more detail than a lightning talk.
So if you have something you want to say that can be put on a poster and want some feedback on it or simply share with the PyCon attendees, please consider making a poster.