Warner Brothers has announced that it has signed a number of deals with large online video networks to show ad-supported branded channels such as TheWB.com, KidsWB.com, plus two new channels showing classic and science fiction programming.

The channels will be available on Joost, TiVo, Sling Media, Daily Motion, and Veoh networks, with WB hoping to attract viewers from the 16-34 age group who are increasingly using mobile and Internet services in preference to traditional TV channels…