The Sensor Network Museumtm - Sensor Networks Protocols
Surveys on routing techniques for wireless sensor networks
- Routing techniques in wireless sensor networks, by Jamal N. Al-Karaki and Ahmed E.Kamal, Iowa State University. link.
The authors divide the protocols into two big groups based on the network structure they are using and the protocol operation details. They give an overview of almost all known routing protocols at the time and a short description of its operation, advantages and disadvantages. Highly recommended reading for beginners in the area and a good reference for researchers.