The advantages to wall-mounted shelving systems are myriad. They can be engineered to fit any space, and unlike built-ins, they can be disassembled and reinstalled if you relocate. Before you make a move, though, check out the definitive guide to all matters pertaining to shelving: Books at Home.
Below: The top of the list would have to be the Vitsoe 606 Universal Shelving System, designed by Dieter Rams. This design-world favorite from the UK is infinitely flexible with various shelf widths and lengths, drawers, desks, and tables which can be configured to suit any storage needs. Available in black, off-white, or beech, exclusively in the US from Moss. Vitsoe's restrained style does not come cheap. A modest desk-and-shelf set-up will run you about $5,000.
Below: The Atlas Industries as4 Shelving System is available in white oak (below), maple, walnut, or custom-painted solid wood. This system is beautifully built of solid wood with very sturdy steel brackets. Multiple components make it extremely versatile. The 5-by-8-foot configuration below is $1,186 per linear foot, or approximately $6,722. NB: Check out Design*Sponge's DIY Atlas shelf guide.
Below: The Endless Shelf, designed by Werner Aisslinger. Connecting 14-inch squares, available in oak or cherry wood veneer, tea (green), or anthracite-stained MDF, and blue, orange or clear plastic. Aluminum joints and adjustable height feet from Luminaire.
Below: Favored by architects and widely used in university settings, the straightforward, well-engineered Rakks System components from the Rangine Corporation are manufactured in Needham, Massachusetts.
Below: Cubitec injection-molded 13.25-inch squares are very lightweight yet strong shelving. A set of 12 sides (which makes four shelves) is $220 from DWR. Also available in orange.
Below: New from Ikea, the Anga Storage Combination features smooth-running drawers with drawer stop. The cord outlet in the back keeps all cords in one place, and the post has a groove for lighting and cabling. $868 at Ikea.
Below: Wall Units from Iss Designs: The base cabinets come in several size and design options, with a choice of cabinets and shelves. For pricing information and to orders shelves and cabinets, call Iss Designs (949-366-0780).
Below: Aliante Shelving System by Rodolf Dordoni for Capellini; supports available in satin or chromed nickel shelves in oak or wenge, among other options. Prices range from $2816 to $3922 at Unica Home.
Below: Ulm Shelving System by Enzo Mari for Zanotta; aluminum alloy brackets and sheet steel shelving; from $109 to $1010 at Unica Home.
Below: The Treku Shelving System from DWR is made in Spain and is available in oak or wenge wood veneer with aluminum brackets. $1,050 to $1,550.
N.B.: This post is an update; the original story ran May 7, 2008.