Los Angeles-based Web 2.0 startup kidthing, which is developing a publishing platform for content focused on children, said today that it has inked an agreement with Wee Sing, a provider of children's songs and music videos. According to the firms, Wee Sing's DVD series will be available for download on the kidthing service, which distributes kid-friendly content and games in its own, controlled media player. Financial terms of the deal were not disclosed. kidthing currently has content distribution deals with Dr. Seuss Enterprises, Penguin Young Readers Group and others. The firm is venture backed by Alpinesky LLC and angel investors.