Bandai Entertainment will be releasing the first DVD today-- and how they kept that a secret is astonishing to me! --and Anime News Network is already streaming the first two episodes. As for the DVD release, the first volume has episodes 1-7, and the rest will come out on volume 2 in September. If you buy both volumes 1 and 2 on Right Stuf by September 8th, you'll also get an exclusive Kannagi t-shirt. Alternatively, a two-volume set will be made available sometime next year.
If you haven't already caught Kannagi and aren't sure if it's something you'd want to pick up at, say, Otakon or San Diego Comic-Con, well, here's the first episode for you to try out.
Interestingly, the anime is sponsored by...Colorado. Heh.