LogoResources for a designer transitioning from print to the web?

A friend of mine who has a background in print design (copy, layout, some photography) is wanting to move his skills over into web design. I am most definitely on the other-side of this divide, so I asked another web designer friend what resources (website/book/whatever) they'd recommend:

I think that's a good start I've purposely left out any core design as he should have a solid foundation in that already

Any more recommendations?