I've also thought about getting a small tv for my treadmill. My treadmill is in a corner, and I could attach a tv bracket to the wall. Perhaps a cheap tv/vcr combo. Yeah, that would be an excellent excuse to watch soap operas again
I love to listen to music, and I don't get bored because it's the only time I do listen to music, other than in my car. I don't own a stereo, I just have my little cd walkman. I burn my own CDs with music that is fast, happy, and good for walking to.
I recently burned a "book on tape" to CD and enjoy that on the treadmill. It would have to be a pretty darned good book, though, to carry that off and not become boring. Language CDs are also good, if you have an interest in learning a new language.
I also love to daydream, mentally shop for clothes or redecorate my house while walking
My treadmill also faces a large window with a nice view. I raise the window, put a box fan in so I stay cool, and the view is better than facing a plain wall. This makes time go faster for me. If I'm bored and hot, then I'm miserable and every minute feels like 10. I tried facing a mirror, but that wasn't as motivational as I hoped, lol.