Viz has now started uploading subbed Shippuuden episodes to Hulu, the online streaming video service. At the moment only the first eight episodes are available. Next week the next eight go up, and a week after that is approximately when the episodes recently aired in Japan start being uploaded. See this article for more.
Direct access to the video is available through the Naruto Viz site. Higher quality versions (original 480p) are available on the Hulu Shippuuden page here.
For those outside the U.S., Crunchyroll will also be providing the Shippuuden episodes. If you are unable to watch the videos on Hulu or the Naruto Viz site, try here.