Here's the original Dora the Explorer that we've come to know all these years:
Originally, many parents were afraid that the new Dora was going to become a streetwalker or be start going the way of Barbie who I hear is getting tattooed. But here's the image that was released of the new Tween Dora:
Here are a few related articles I found explaining the new image and the reason behind the change.
New Tween Dora Causes Uproar Among Parents
Added 04/06/09: So PastExpiryCartoons posted a link to this in my comments (don't know if you read comments on blogs). I thought I'd add this because you really have to have an open mind to appreciate the humor behind this. Or you can look at it and understand why parents get into such a hubbub about change to their children's beloved characters.
Courtesy of Past Expiry Cartoon