Vidcast.com and Kewl.com would obviously command a higher price now then they would have back in 1997.
I would normallly agree with westblock on his assessment of these names, but after watching this market for some time now, I think these are "keepers". For the simple fact marketers who go after tweens, and twenty-somethings would use the above names to "market" products to them.
I don't recommend buying these types of names, but if you are going to make sure the name works with .TV.
Stay away from "cutesy" or "creative" names, like "Qool.tv"....