I've been playing Warsow. It's a free first-person-shooter, and best played with at least three Red Bull's in a row You can find more free games here (Steam), here (open source) and here (EA Games). I also like AaAaAA!!! - A Reckless Disregard for Gravity. The game plays as a typical indie game in the beginning, but it gradually introduces you to the basics of paragliding. Pretty awesome. Also, Postal III will be released tomorrow, and I've been waiting ever since I finished Postal 2 8)
You can also play with the kitten at the left top of this website by clicking on him/her and then move your mouse.
I finished RDR single player a few months ago, but I'm not sure I should get the DLC (because zombies+cowboys wtf). What do you think?
Best trophy ever I also liked that there was a similar mission in San Andreas, even though it was hidden.