The Simple Design & Testing Conference is next weekend (September 12-14) at Microsoft's office in Downers Grove, IL. This is the third year of the conference. It is an open space conference and the price is right (free). You do have to register and write a short position paper. For more details see: http://sdtconf.com.
I have found that this conference has great discussions and with regards to this topic better content than the Agile Conference. If you have time please come by and check it out. See you there.