This is one thing that I just love about Coldplay - that they are not that commercial. Their singles often can be downloaded free and some proceeds donated to charity. This album is also downloadable FOC here.
Songs that make me on the verge of crying: Fix You, Viva La Vida (possibly the greatest recording EVER) and The Hardest Thing. The purpose of the free album was to show gratitude to fans. The band stated that "playing live is what we love" and that the album is "a thank you to our fans – the people who give us a reason to do it and make it happen."
Would be so great listening to them live. One day.