Here are some links to pages with some  thoughts, discussion and links to specific topics 

 

The Helmet debate

Why cycle lanes are fatally flawed

Riding on pavements

The Price of oil 

 Parking and locking your bicycle

Bicycles on public transport 

Too hilly

Wind  

Rain

Glass on roads

 Utility style bicycles vs Mountain Bikes in urban environments.

Internal hub gears vs. derallieurs

Dynamo vs battery powered lights

Baskets vs backpacks

 Sit up and beg posture vs head down arse up

Narrow vs wide tires

 Valves