Victory Game Center

http://www.xcom.com/enemyunknown/
Last Stand - https://www.youtube.com/watch?v=UNyhyzjYCks
Security Breach - https://www.youtube.com/watch?v=fd9CmpLZVMI

Jake Solomon undercover - https://www.youtube.com/watch?v=T1pyJxcETmc

Jake Solomon wrote: Your soldiers are out there. They're dying from decisions you've made. You're crying. You feel terrible about yourself. Sound like a good time?

Jake Solomon wrote: You can be playing for like 10 hours and lose this game. That doesn't sound like fun when I say it like that. But it is.

Ironman Impossible - https://www.youtube.com/playlist?list=P ... tc2DfC8x3D

The best series of YouTube game videos I've ever seen. Entertaining, informative, and well-edited, Beagle does an amazing job showing off the Ironman Impossible mode. If you love XCOM, you've got to check this out. I only wish he'd do more of these instead of the unedited Live and Impossible videos he's been doing lately.

Long War Mod - http://www.nexusmods.com/xcom/mods/88

A lot of great things have been said about this mod, but I haven't played enough vanilla XCOM to warrant checking it out yet. But if what they say is true, it's one of the best mods ever made. I'll probably never get around to trying it though, since I don't see myself beating XCOM between now and the time XCOM2 comes out. Jake Solomon seems to think highly of it though, so perhaps a few ideas of theirs have made it into the sequel.