rjh01
Gentleman of leisure
BeAChooser's first link is to some of the Navy's research. They did (IIRC) a 10MJ test so far, haven't heard of anything stronger yet (note, the article claims it is a 32MJ weapon, which is correct...but the test shot they show is only at either 5MJ or 10MJ...it's been a while and I can't recall the exact details). Useful search terms are Navy, rail gun, BAE (they are the contractor that developed it), and Surface warfare Center.
The Navy lab that is working on this can be found at http://www.navsea.navy.mil/nswc/dahlgren/default.aspx; they have a link there (second from the right in the top row) to their rail gun project, but it appears to be down right now.
The link you point to is http://www.navsea.navy.mil/nswc/dahlgren/ET/railgun/default.aspx
I cannot see any dates later than Feb 09 on the site.