diyAudio - Simple low power amplifier

Hey there.
The other day a friend from a computer store offered me some malfunctioning computer speakers. While checking them to see wich ones could be saved I found one made from only 3 transistors and a few other components. I will try to post a picture later. The design is quite funny because they faked a stereo design by using a dual ganged pot for the volume and then mixing the two channels together :D.
But the design interested me because of the simplicity and the low part count. I've been looking for a design like this one to teach some electronics to my nephews but what other designs do you guys know? I want something made with discrete components, not chips, so that I can show them in the oscilloscope how each stage and each component behaves.
Thank you