Remember back when i spoke about Japan's MGS4 website launching? Well the US one is now online, and it got something interesting. What's really nice, other than getting stuff in English now, is that, at least on my computer, anything you did on the Japanese site, is saved to the US one. So whatever missions you beat, things you bought, points you earned, they're all in tact. Other than that, there's a few new downloads like PSP wallpaper and more songs to play on the site. also, some more characters were added to the list, such as Rosemary and Mei Ling, both of which are yet to appear in any footage. English voice clips were also added. Note, Mei Ling's voice is the one used in The Twin Snakes, and not the original Engrish one from Metal Gear Solid.
Metal Gear Solid 4 - Offcial US Website