Interesting threads
At some point these links will probably find pages to move to, but for now we'll just collect them here for reference.Links
MOSFETs as clipping diodesRelays and zener diodes
Using SMD components
Bias voltage, quick, clean, cheap - Bias voltage using LM386!
Signal generator
Piggybacking transistors - or using dummy transistors to lower gain of si transistors.
Parallel transistors