I was sooo pissed off when PSN went down. I have both a PS3 and 360 but just lately have been buying everything on PS3 so have hardly any 360 games. I was actively playing Killzone 3 Multiplayer, Dunger Hunter Alliance Co-op and dead nation co-op. The first few days it was off I was fed up as I was hoping to get some good killzone 3 time in with friends as everyone was off for the holiday.
I have to say though as the days dragged on I ended up playing games that have been sat there for ages. With being a PSN+ member I had recently got all the Sam and Max episodes free and so started playing through those. Then I went on to start Fallout 3 on PS3, even though I had racked up over 100 hours on the 360 version I was hooked once I started playing. With having all the DLC packs with being a Ps+ member I had a blast playing through it. Also I got back into Super Street Fighter IV, played through the Stacking DLC which luckily I managed to buy before it all went to shit.
I am also playing through some games I got on sale from steam during the Christmas holidays that I had hardly played at all. So while I can't wait to get back online, it has helped me plough through some of the many, many games I have acquired and never seem to get around to playing.