O\'Reilly Where 2.0 Conference
O'Reilly Where 2.0 Conference explores the emerging consumer and enterprise ecosystems around location-aware technologies--ecosystems that increasingly impact the way we work and play. Location-determining technologies like GPS, RFID, WLAN, cellular networks and networked sensors enable an ever-growing array of capabilities from local search, mapping, and business analytics to enterprise integration, commercial applications, and software infrastructure.
It seems to be marketing and techno-oriented, focused on the usage of LBS but not really from the HCI point of view. Might be worth anyway to have a glannce at what is discussed there.