• An Introduction to Internet Protocols -
  
  National University of Ireland a good basic introduction to internet protocols, including TCP/IP, ftp, HTTP, etc. For people who want to get started in Embedded Internet.
  
  
• The Scientists and Engineer's Guide to Digital Signal Processing -
  
  A good introduction to the fundamentals of Digital Signal Processing
  
  
• ControlNet International Ltd. -
  
  A non-profit organization managing the ControlNet industrial networking technology. Provides information and support to vendors and users of ControlNet products, as well as a forum for members to provide direction for the future of ControlNet technology.
  
  
• DeviceNet (ODVA) -
  
  Independent organization that oversees and manages DeviceNet specifications. ODVA works closely with its vendor members, end users and distributors to further establish DeviceNet’s standing as the premiere choice for open network communications in industrial automation
  
  
• EtherNet/IP -
  
  industrial networking standard that takes advantage of commercial off-the-shelf Ethernet communication chips and physical media.
  
  
• Jones On Stepping Motors –
  
  A good Stepping motor tutorial.

WHITE PAPERS:

Convergence of Microcontrollers and DSPs

This exhaustive white paper by Bill Giovino (Executive Editor of Microcontroller.com) was originally published in Embedded Systems Programming magazine. It describes the differences between microcontrollers and DSPs, and describes some the new, surprising applications that require both products in unique combinations.