Have you discovered Fabchannel yet? Watch streaming full length concerts right from the site without logging in, creating an account or anything else! Just search for your favorite artist and see what comes up. So far I've watched MGMT, Fiery Furnaces and Andrew Bird...and of Montreal (both times), of course. If you didn't get a chance to see them on their "Ninjas Prove It" tour, this is as close as you're going to get. This show is slightly more stripped down than the tour version, but there are still some theatrics and personally I prefer this version better.
And speaking of Andrew Bird, my good friend, Eddy, over at The Collapsaform Libraries has brought it to my attention that you can download his latest album, Noble Beast, free for personal use at Megaupload. Enjoy!