As of this blog post there are already 117 people registered for PyCon! You can see the list of publicly viewable attendees along with a chart of the growth of registration. If you have not registered yet but are planning to attend PyCon 2007 (which I recommend you do), go to the registration page. PyCon is dirt cheap for a conference and is tons of fun! I personally have a list of people I look forward to seeing every year at PyCon, many of whom I didn't even know until I met them at the conference.