Go to the search bar on the store and type in: Battlefield 3
Look on the list carefully, you'll see it. If you don't, try exiting the store then relaunching.
Or just search the word, beta. It narrows it down to pretty much the BF3 beta.
Downloading now. Actually I started downloading the second the Store updated (lots of refreshing), but it's taking so long because all of you (and everybody else) are clogging the servers and slowing my download down to a crawl.
The funny thing is I DIDN'T find it when I used the search, but instead just did "View All By Title >>> B >>> Battlefield 3" and it was right there on top of all the other 5 downloadables.
Can't log on to Battlelog though but whatever, I don't really care. We'll probably be allowed there on the 29th if not very shortly.
PS: I haven't been back to this board in a long while!