The British Chiropractic Association offers much general and postural advice, many accompanied by short videos. Some of these can be found below (in .pdf format, minus any videos). It is always worth checking their website for additions.
Bags - Handbags, Laptop bags, rucksacks. What not to do with them.
Bank Holidays - Travel or DIY?
Bra Fitting - The importance of correct size.
Car Set-up - Take the pain out of driving.
Commuting - Most of us do it.
Computer - A postural minefield.
Driving - Take more pain out of driving.
DIY - A world of begrudged pain
Gardening - Ease the strain
General Posture - Head up, back straight..
Golf - Not quite a natural action
Holiday Travel - Planes, trains and automobiles...
Lifting - To avoid injury.
Posture Indoors - For couch potatoes
Posture Outdoors - For potatoes
Pregnancy - Ease the discomfort
Skiing - If one must.
Sleeping - One must.