http://www.kids.farhathashmi.com/ (Arabic Rhymes under the Rhymes tab)

http://kids.islamweb.net/ (very nice Islamic stories and songs in Arabic)

http://www.arabicfirst.co.uk/ (Simple Arabic stories and presentations)

http://bookstolearnarabic.wordpress.com/more/arabic-stories/arabic-stories-grade-1/ (Arabic stories in PDF)

http://omarmariam.irsyad.sg/ (Simple Arabic books with audio)