The following is a list of articles on Peltier devices (if no hyperlink, coming soon)
The theory side
Understanding thermal models
The Peltier Model (MEDTEQ style)
Deeper understanding of the Peltier model
The full system model (external parts)
Using circuit simulators
Mathematical analysis
The application side
The butter cooler
The one beer cooler
Room air conditioning
The fridge (with moving parts)
The fridge (no moving parts)