Differentiated Science/Reading Web Resource, Naturescapes
The good folks at Naturescapes have created a web resource that actually differentiates reading by using Science content.
I have taken 3 screenshots of the first two paragraphs of three different pages about the cactus.
Here is the basic page (real page):

Here is the more details (real page) web page:

And lastly, here is the more in depth (real page) web page:

This web resource supports the Universal Design for Learning Principles in the following ways:
To support Recognition Learning, the information is presented in three different formats.
To support Strategic Learning, the authors provided digital collections of images and information to narrow search
And to support Affective Learning, students are provided with Choices of Content based on their literacy abilities)
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