Articulation activities - all sounds and levels
http://www.quia.com/pages/havemorefun.html
http://www.quia.com/pages/speechersclass.html
http://www.quia.com/pages/allpicturesfun.html
http://www.speakingofspeech.com/Articulation_Materials.html
Reading level
http://www.eduplace.com/tales/ (try to use words with your speech sounds to make funny "Mad Libs" and read aloud!)
http://www.communicationconnects.com/stories.asp (write your own story or read a prewritten one with your sound!)