There are a lot of interesting online courses on techonline's website :

2005 Top 10 courses :

Introduction to ARM
Embedded and Real Time Systems
Understanding Wireless Communications
An Overview of Digital Signal Processing
Design Languages for Embedded System
Broadband Wireless Access
How a Sigma-Delta ADC
DSP Architecture and Applications
Zigbee Overview and Products
Posted on 2005-03-02 03:54:38 by Dr. Manhattan