I think the Berkeley website is better than textbooks and much more accessible: a couple hours reading can give you a strong idea of the science and it can be updated when errors are found (the problem noted with textbooks).
I recommend their Evolution 101 for starters:
Evolution 101 - Understanding Evolution
It starts with a definition of evolution as used in science, rather than some creationist misconception, and then builds on that with examples.
Another good website is from the U of Mich, with
Certainly one should use university material, if it is accessible, as this is where evolution is being studied. I understand Harvard (or was it MIT) was posting website course material this year, but I haven't looked to see what they have on evolution yet.
Enjoy.
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