What is a modlet? Simple!
Literally, that's what it is. A modlet is a very small, generally one purpose mod designed with a very specific goal in mind. There's generally no configurability, just a single .dll, and probably one file of source code. They're very simple, straightforward additions to the game. Some example modlets are Claw's Stock Bug Fix Modules or Malah's Quick Mods
This thread is where I will be posting my "modlets", the first of which is Field Experience.