Well, you could try The Japan Shop's site right here:
http://www.thejapanshop.com/home.php?cat=249
They have several bilingual books listed. I would recommend the クレヨンしんちゃん (Crayon Shinchan) series, but it seems that they are all sold out. They are great for practice because they are so goofy it doesn't seem like you are studying. I guess that I should have bought more when I had the chance.
You can check out
http://www.jlist.com/ (If you are under 18 or easily offended, I recommend clicking on the JBox link instead of JList. Just a warning). Do a quick search for "bilingual" and you'll get a ton of hits.
You could also try this site:
http://www.his.atr.jp/~ray/stories/ if you are just looking for some reading practice. You could print out the stories to read them whenever you want, I suppose.
I hope that helps.