3D Puzzles

Bubble Trouble
Rearrange the 3D cluster of bubbles by moving one bubble at a time into the empty space. (Like a 3D sliding picture puzzle)
http://www.geocities.com/SiliconValley/Lakes/8620/bubbletrouble.html

The K-Ball
3D logic puzzle featuring 3, 8, and 26 segment versions. Requires Flash.
http://www.sphere-mania.com/

Livecube
Puzzle with millions of combinations. Requires Flash.
http://www.livecube.com/

Rubik's Cube Java Applet
Scramble the colours then try to right them again. With mirrors to see the back of your cube this modern classic puzzle works very well on the web.
http://www.schubart.net/rc/

Rubik's Puzzles
A collection of puzzles by Erno Rubik, creator of the Rubik's Cube.
http://www.dotsphinx.com/rubik/

Twisty Puzzles
All kinds of odd shapes of 3D puzzles in addition to the usual cubes.
http://byrden.com/puzzles/

VirtualCube 3x3x3
Learn to solve Rubik's cube by learning 3 simple tricks.
http://www.ganpuzzle.com/vcube333.htm