The range of promotional marketing is huge. Think about the amount of promotions being run by companies at any one time and how diverse they are.
Here we will look at as many of the promotions as possible, but I challenge you to find a brand that isn't or won't be, in the near future running some sort of promotional activity.
As always, info, links to other interesting places, creative and interviews with people wiser than me.
Cheers
Steve