For Internet junkies with high-speed access, there’s a growing set of options for viewing online TV shows and movies. Sites like Hulu.com, Joost.com and even YouTube.com are showing full-length TV shows online. While YouTube is far behind Hulu and Joost in that regard, at least iPhone owners can watch YouTube videos on their mobile screens. When I stumbled upon Joost in the Apple App Store, I was pleasantly surprised. I had briefly used Joost’s client-side Mac video viewing application in its early days, back when Joost had very little content … then forgot about it.