I just have to share these websites. The first one is the International Childrens' Digital Library. This site has digital versions of books. The super cool thing is that you can search for books in all kinds of languages!! There are tons in Spanish! It's difficult to find Spanish children's books for a decent price, so this is really cool! The website is set up well and easy to navigate.
The other website is a list of literacy games and other such things that include activities in Spanish. GameGoo is by Earobics, a program my school district uses. The main page is a new bilingual publisher I guess.