Sites we don't endorse for a reason
Be cautious with TAN books, and Pauline Media (Daughters of Saint Paul): both have dissident authors among their sales!
Bookstores
Must view
http://www.ewtnreligiouscatalogue.com/BOOKS/cid=13/shop.axd/Category
Others
http://www.indcatholicnews.com/tryashop.html
NFP Issues
http://www.pop.org/books/popcontrol/
Books about books
http://www.love2learn.net/bkbteduc/bkbtbook.htm
Books online
http://saints.sqpn.com/indexebk.htm
http://www.ewtn.com/New_library/index.asp
http://www.vaticanlibrary.va/home.php?ling=eng
http://www.vatican.va/holy_father/john_paul_ii/jubilee/index.htm
http://www.vatican.va/archive/books/index.htm
http://www.vatican.va/holy_father/john_paul_ii/
c.f. Bible Translations we endorse
Children's books
Watching propoganda in childrens books
http://www.catholicleague.org/research/childrenslit.htm
How to choose kids books
http://www.domestic-church.com/CONTENT.DCC/reviews/reviews.19980701/KIDSBOOKS.HTM
Children's books
http://www.ewtnreligiouscatalogue.com/Children+s/cid=19/shop.axd/Category
http://www.frcoulter.com/books/children-books.html
http://www.catholicmom.com/childrensbooks.htm
http://www.ignatius.com/category.aspx?SID=1&Category_ID=10
http://www.ewtnreligiouscatalogue.com/
Apologetcs
http://shop.catholic.com/cgi-local/SoftCart.exe/online-store/scstore/p-B0279.html?E+scstore
http://shop.catholic.com/cgi-local/SoftCart.exe/online-store/scstore/p-B0112.html?E+scstore