I'm pretty sure that Peter killed the shapeshifters he did so that alt-"Olive" would receive the message that Peter was offing the alt-verse's agents. The list was presumably all of their shapeshifters, and he killed ones that lined up with the letters O L I V E (except for Newton, who'd died previously).
"If this episode had one major flaw, it was that a lot of convenient stuff happened to make the plot fall into place, including that Olivia and Peter had the exact same computers"
I dunno about io9, but here at my workplace, everyone gets identical laptops. I assumed they were FBI issued, so they were the same make/model.
@SteveZim1017: TS is probably Tissue Sample. I think the CDC dude is going to infect one of the survivors to get some new samples of the zombie virus in action.
Given how many of the 360 and PS3 games in your guides are cross platform, maybe next year you could do 4 guides: 1) Wii 2) HD Crossplatform 3) Xbox360 (exclusives and downloadables) 4) PS3 (same)
@Chuck: Yeah they had different tech. The tech over here made the wall weak, so you could walk through it. The tech over there just makes a hole in the wall.