Cycling Etiquette means different things to different people. Some motorists and pedestrians think it is an oxymoron!
Nonetheless, it is a subject that should not be ignored, so here are some links to a variety of sources in different countries.
Etiquette according to the St Kilda Club in Melbourne
Etiquette according to the readers of the Calgary Herald
How to behave at the coffee shop!
How not to be a fish and chip cyclist - more British humour, with some good tips as well
Hand signals
One of the Victoria Peloton is an example to the rest of it when it comes to hand signals - thank you Doug!
http://www.active.com/cycling/articles/8-cycling-hand-signals-for-your-next-group-ride