I am planning to use a MAX3421E in a project I'm working on but I'm also new to this chip and to USB Hosting so I probably cannot help much. And, I'm not using a PIC for this.
However, Jan Axelson has a new book on Embedded USB which Amazon will have in November. She also hosts a forum where she answers questions about all of her books, articles and things like this. I think I've bought all of her books in the past 10 years or so and find her to be one of the best technical writers ever - she presents things clearly, making most things easy to understand. That said, she may have her work cut out for her explaining embedded USB.
EDIT: There is a sample chapter available - see the USB forum. It looks promising.
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