Alan V. Oppenheim has a number of video lectures on: Signals and Systems (up on MIT OpenCourseWare).

Here is the complete list of video lectures:

• Lecture 1: Introduction
• Lecture 2: Signals and Systems: Part I
• Lecture 3: Signals and Systems: Part II
• Lecture 4: Convolution
• Lecture 5: Properties of Linear, Time-Invariant Systems
• Lecture 6: Systems Represented by Differential Equations
• Lecture 7: Continuous-Time Fourier Series
• Lecture 8: Continuous-Time Fourier Transform
• Lecture 9: Fourier Transform Properties
• Lecture 10: Discrete-Time Fourier Series
• Lecture 11: Discrete-Time Fourier Transform
• Lecture 12: Filtering
• Lecture 13: Continuous-Time Modulation
• Lecture 14: Demonstration of Amplitude Modulation
• Lecture 15: Discrete-Time Modulation
• Lecture 16: Sampling
• Lecture 17: Interpolation
• Lecture 18: Discrete-Time Processing of Continuous-Time Signals
• Lecture 19: Discrete-Time Sampling
• Lecture 20: The Laplace Transform
• Lecture 21: Continuous-Time Second-Order Systems
• Lecture 22: The z-Transform
• Lecture 23: Mapping Continuous-Time Filters to Discrete-Time Filters
• Lecture 24: Butterworth Filters
• Lecture 25: Feedback
• Lecture 26: Feedback Example: The Inverted Pendulum

To get the most out of the video lectures, it would probably be a good idea to work through the assignments and readings too.