There is a Christian Kids channel that we can stream live now. It is not mentioned on the Roku site, but if you install the TBN Channel (which automatically puts some people's flags up), and look at the live TV section there is a channel called "Smile of a Child". Most of the cartoons are low budget, but it does have some good shows like Flying House, Davey and Goliath, and Really Wooly kids. Here is a link to their programs: http://www.smileofachildtv.org/watch/schedule_weekview.php
Oh and did I mention it is free?