As part of The Big Picture movement, Starbucks promoted a day in March when New Yorkers brought in their travel mugs for free coffee. (Film)
On Thursday April 15th, Starbucks is expanding their experiment to most of the world. If you bring in a travel mug, up to 20Oz, to any participating barista location on April 15th 2010; they will fill it up with coffee, for free.
Along with the ‘big day’ Starbucks will give you 10 cents off any beverage, any day. I don’t know that this is a new program but either way its pretty sweet, especially if you go for coffee on a regular basis.
They have a part of their site devoted to this cause, on which they have a calculator of how many trees you could save based on the number of cups you drink a day. Side note of pessimism: I would like to see the calculator of how much money Starbucks will save if people brought in travel mugs regularly(especially if they bought one for 20 [Star]bucks).
Enjoy Your Coffee!