Following a recent survey which reported that increasing numbers of children are starting school without having been read to, The Guardian published five lists of books by age group The best children's books ever.
With the enormous number of books available it can be difficult to make a choice which is why browsing is so important. Another help to selection is recommendation which is why we recommend books to each other in Library lessons. I also issue Reading Suggestions regularly and have many lists by genre.
Online - look at the Book Choosers which are linked on the right in this blog, or visit the selections I have made at Lovereading4schools.co.uk. I have lists of recommendations for years 7, 8 and 9 which you can see here http://www.lovereading4schools.co.uk/viewschool/1870/favourite.
This is the website of a children's online independent bookstore which features only children's books. It's free to register and obviously there is no obligation to buy. The sister site http://www.lovereading4kids.co.uk/ can be searched by many categories, features over 5000 opening extracts, profiles authors and offers the useful Author Like for Like.