My copy of "SIP: Beyond VoIP" arrived this morning and I'm anxious to begin reading it. Written by SIP gurus Henny Sinnreich of Pulver (and before that, MCI), Alan Johnston of Tello (also an MCI vet), and Robert Sparks of Xten. Alan, and Robert are co-authors of RFC 3261, the current version of the SIP specification.
This book is intended to go beyond the "what is SIP?" topic and instead explore applications of SIP for services such as location and emergency services, presence, and real-time collaboration. It also covers topics including security, P2P, mobility as well as access to SIP-based services for disabled people.
The challenge of course will be finding time to read this in between nightly fixes of "FoodTV" programming.