I have been to WIPTE the past 2 years and I can say that it's been a great place to hang out and meet other Tablet PC folks focused on education.  This year's event has now been scheduled for October 15-16 and information is up on their site.

WIPTE is open to anyone with an interest in instructional technology. A wide variety of disciplines are embracing Tablet PC's and similar pen-based devices as tools for the radical enhancement of teaching and learning. This conference is intended to leverage this shared passion and to identify best practices in the educational use of pen-based computing so that all educators may benefit from this next generation of technology. Each WIPTE paper presentation includes an assessment component as an important part of the presentation. The WIPTE program also includes keynote talks, poster presentations, vendor booths, panels, and special sessions.  Learn More - (PDF LINK)

If you are interested in Speaking or Writing a paper to be published in their book, check out the information on their site.