And while you're thanking Samsung for the freebie, you can also share your postcards with others on Samsung's Olympic postcard wall which is linked below. You can expect delivery of the cards in the US, UK, Australia and Germany within 2-5 working days. Other locations may take longer depending on the postal system in the country.
The cards are printed on 4.5 inch x 6 inch thick, glossy stock at 300dpi resolution. You can also create postcards while offline and have them sent while online. To get started, you need to install the Touchnote app.
source: Samsung, Touchnote via AndroidCentral