Mechanical

Brain Binders
Paper puzzles free to download.
http://www.teachnet.com/brainbinders/

Brass Puzzles by Rocky
Maker of hand machined brass puzzles.
http://brasspuzzlesbyrocky.com/

Hockey Puck Puzzle
Offers a Rubik's cube related 3D puzzle shaped like a hockey puck, with many different design patterns.
http://look.net/hockeypuck/

Impossible Bottles
Learn the puzzling art of putting large objects into small bottles.
http://www.puzzlesolver.com/list.php?cat=5

Livewire Puzzles
Makes wire puzzles of various levels of difficulty.
http://www.puzzles.ca/

Meffert's World of Puzzles
Manufacturer of many different types of Rubik like puzzles.
http://www.mefferts-puzzles.com

Parlor Puzzles
Collectibles, puzzles, and gifts.
http://www.parlorpuzzle.com

Passion for Puzzles
Collector site offers information about puzzles like Rubik, includes pictures, solutions, and strategies.
http://www.passionforpuzzles.com

Potty Puzzles
Puzzle site with wooden assembly, burrs, wire and many other types of mechanical puzzles. (UK)
http://www.pottypuzzles.com

Puzzle & Craft Factory
Provides Puzzles, Brain teasers, Toys and Games to people of all ages and skill levels
http://www.puzzle-factory.com/

The Puzzle Museum
Source of information concerning mechanical puzzles and their history.
http://www.puzzlemuseum.com/

Puzzle People Page
Directory of mechanical puzzle collectors, as well as other information.
http://www.toad.net/~elva/slocum.html

Puzzle World
Different varieties of mass produced mechanical puzzles as well as individual hand crafted puzzles and information for collectors.
http://www.johnrausch.com/PuzzleWorld/default.htm

Puzzles.com
Home site for the Binary Arts line of mind puzzles.
http://www.puzzles.com/

PuzzleSolver
Solutions for the Rubik's Cube and many other mechanical puzzles. Post questions and get answers on the puzzle message board. Has a Puzzle of the Month page.
http://www.puzzlesolver.com/

Slube: Sliding Puzzle Cube
A sliding puzzle cube similar in look to the Rubiks' Cube. Contains information on how to purchase the game, news, and a gallery.
http://www.slube.co.uk/

Tangrams
Ancient Chinese puzzle consisting of 7 geometric shapes. Learn its history, make a set, or try solving one of the shapes.
http://www.tangrams.ca

Tavern Puzzle Collection
Metal puzzles, created by blacksmith Dennis Sucilsky. Puzzle descriptions, and solution pages, complete with diagrams for taking apart puzzles and reassembly. Produced by Tucker-Jones House, Inc.
http://www.tavernpuzzle.com

Tumbler Puzzle Solution
Step by step guide to solving the Nintendo Tumbler puzzle.
http://www.smartbytes.co.uk/Tumbler/