There's been several ways to vote on reality tv but, there's growing opportunities to further control tv/shows through the net.

http://controltv.com/
Was a 1,000 hour project that viewers could control Tristan Couvares live streamed on the net. Season 2 next year.

http://current.com/studios/
Is a new tv series "Bar Karma" wherein audience input is key. You can litterally post a line for the characters to say and, they might just say it. One person even sent in artwork that was used in the show.