I have made some iGoogle Gadgets with canvas view, these are analog opamp tutors. Interactive Tutorial with Simulated Meters and Potentiometers, demonstrating how Operational Amplifier functions in different configurations.
Op-Amp Simulation using Javascript
Inverting Amplifier Gadget – Get Inverting Op-Amp Tutorial
Non-Inverting Opamp Gadget – Get Non-Inverting Op-Amp Tutorial
Buffer Unity Gain Amp – Get Buffer Unity Gain Op-Amp Tutorial
Dual Differential Amp – Get Dual Differential Amp Tutorial
Differential Amplifier – Get Differential Amp Tutorial
Instrumentation Amp – Get Instrumentation Amp Tutorial.

If you wish to examine the code – Analog Tutorials Project Page
Introducing a new delabs icon – Elektrick the Power Jedi
I am also attempting a Toy Scope or a waveform display, Not done yet.