Family On Board is an online store with a large selection of travel gear specifically for family trips.  By category, they carry luggage and organizers, child safety items, car and plane comforts, music, video, and books on CD, and travel games for the backseat or the whole family.  I like their buddy packs, which are game kits for kids and include all the things I like to give my daughter when we’re traveling, like stickers, small games, and activity books.