Steam are selling Bastion for half price over the next couple of days. And you should buy it. Really, right now. Supergiant Games have created an absolute masterpiece featuring tight combat, beautiful art direction and a truly heartbreaking storyline delivered by an impeccable omnipresent narrator. It's unique, thought-provoking and wondrous; a game that reminds us why we love our medium as much as we do.
£5.74 is the cheapest price on any platform at the moment, so I'd get involved immediately. Bastion is probably my favourite game of 2011 thus far and I'd recommend it without hesitation.