The Metal Gear Online
beta is now fully operational. Another (thankfully, smaller) update has been released which will need to be downloaded first. Once done you will be able to play -- as long as you can connect to the server. Obviously they're being hammered right now, so it make take a few tries to get on. Didn't take us more than three attempts, so persevere. Once in, you can create a character and start your training before heading into a proper online game. Be sure to let us know what you think. Enjoy!
[Thanks to everyone who sent this in]