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Edit - Open beta now live.
Nvidia beta drivers for up to 38% performance improvement http://www.nvidia.com/object/win7-winvista-64bit-285.38-beta-driver.html
Battlelog site where you join servers from, view your soldier stats etc http://battlelog.battlefield.com/bf3/
I only noticed this when looking at Stephen Ried's twitter last night. Multiplayer open beta starts up on 29th September on all 3 platforms and runs for a month.
Granted it's only 1 map (I think) but at least it's finally something new to fill the time until it and some of the other titles release in the next wee while.
If you've pre-ordered the game via Origin or got early access with Medal of Honor you'll get an email tellling you how to get into the beta 48 hours early on the 27th.