Mechanical

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

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

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/

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

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

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

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

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

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

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

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

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

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

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

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

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

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