I discussed playon which streams from your computer to the television, its merits and trying it free to make sure your internet speed and computer are adequate on this blog: http://tvwithoutcable.blogspot.com/2012/03/more-roku-channels.html
My first video can be seen at: http://tvwithoutcable.blogspot.com/2012/03/roku-mini-tour-tv-addiction.html which gives a mini tour of Roku on television.
Some additional student-friendly channels on Roku include: new channel iFame which has indie movies, music, dance, and even some hip hop and classic comedy from Three Stooges and Abbott and Costello; Party Rockers Dance Reality, TED (some courses use these), Revision3--geekbeat and net news, AOLHD-cooking to gadget new, many radio channels, many sports and movie channels previously mentioned, Giant Bomb-video game reviews and previews, Twit-tech, Tested-smartphone, tablet camera reviews, Screened-trailers and more (some humor), Crunchyroll-anime, Live Exercise and other exercise channels, cooking channels, Kid Paint-like Mario Paint, comedy from Funny or Die and Break, Blinkx-videos, Kung-Fu Theater and so much more! There is are vimeo, picasa, flickr, shutterfly, Smugmug, Facebook photos & videos, horoscopes, travel, international stations, and religion channels. Games are probably at cost. The budget $49.99 Roku LT when available comes without angry bird game. You can also get private channels to put on Roku. And....if you don't like a channel, press the asterisk on your Roku remote, follow the prompts and voila...it's gone. Come back for more ideas and enjoy the show!