By Rick BroidaLike most parents, I'm concerned that my kids get too much "screen time," what with the TV, computer, Wii, iPod/iPad, and so on. But if that time is spent reading, or at least flipping the pages of a book, I don't mind it one bit.That's why I continue to be a relentless fan of children's e-books, which are increasingly abundant for iOS devices. Indeed, in the last couple of weeks alone, nearly a dozen new and noteworthy titles have arrived in the App Store. Here are the ones I think make for worthwhile screen time."Horton Hears a Who" and "The Cat in the Hat Comes Back": Two of my favorite Dr. Seuss titles just arrived in Oceanhouse Media's ever-growing catalog. Both on sale for $2.99, and in fact all the Seuss apps have been discounted from 25-75 percent off (this week only) in honor of Dr. Seuss' birthday."Jeremy Fisher: Buddy Edition": "The Tale of Jeremy Fisher" comes from Beatrix Potter, who, of course, is best known for "Peter Rabbit." I won't say this story has the same appeal, but it does offer an interesting gimmick: Buddy Reading, which leverages Game Center to allow a parent or other relative to read the story on one device while the child listens on another. Setup is a one-time hassle, but this could be great for the parent who travels a lot. The app costs $1.99; you'll need to buy it twice, once for each device.