for css, i'd recommend
Eric Meyer on CSS
More Eric Meyer on CSS
books..
also a website to see the wonder of CSS would be csszengarden.com
also, if you aren't running Firefox with Firebug and Colorzilla, you are missing out on an entirely new/rich experience
php books are a dime a dozen.. i can't specify just one... but you should definitely have php.net bookmarked..
