Here are some sites with great cabinet and bookcase design and installation ideas:
Design Tips:
Better Homes and Gardens (styles & decor) and Design a Room Tool
House Beautiful (design inspiration)
Real Simple (home & organizing)
Simplified Bee (home organization & design)
Woodworking and Renovation:
Mental Floss (amazing bookcase assembly video)
Bored Panda (creative bookshelf designs)
Web Urbanist (20 best bookshelf designs)