The Department of Classics and Ancient History of the University of Manchester Faculty of Arts has posted a list of modern books translated into Latin on its web-site.
The Hellenic Bookservice has a section called 'A bit of fun' that features English-Latin translations of chidren's books as well as other attempts to make Latin fun, although Minimus (the mouse) by Barbara Bell has his own section on the Hellenic site.
There are also lists on Amazon's Listmania, including 'Books that Latin students will actually enjoy' and 'Fun literature in Latin (and for kids).'