Okay, what have I missed?

5x5x5 Variations

Pyraultimate
Fused Cubes
Siamese Cubes
7x7x7 extended cube
Special 2x2x2


4x4x4 Variations

Fused Cubes
Siamese Cubes
Cuboctahedron

There are also 10 known bandaged variations:
1)2x2x2
2)3x3x3 (uses the four middles as one middle and pairs the edges)
3)3x3x2 Domino (same as the 3x3x3 but connects the side middles to the up and down sides)
4)3x3x4 (same as the 3x3x3 on top and bottom but leaving the side middles alone)
5)2x2x3 Wide tower (normal) (same as the 2x2x2 but pairing the side edges together)
6)2x2x4 (same as the 2x2x2 but leaves the side middles and edges alone)
7)4x4x2 (connects a side edge or middle to a top or bottom respectively)
8)4x4x3 (connects the side edges together like the 3x3x3)
9)2x3x4 (makes the side edges and middles into only two blocks, and top and bottom is like 2x2x2)
10)Wall Cube 2x3x4

3x3x3 Variations

26 sided cube (everything shaved)
3x3x5 extended cube (add 9 cubies to top and bottom)
Fully extended cube (add 9 cubies on every face)
5 sided cube (add cubies to make triangle shape)
Ball in the wall cube (fuse a ball 3x3x3 into a normal cube)
Wall in the ball cube (what you do with the leftover pieces from above)
Barbell cubes
Fused cubes
Siamese Cubes
Slim Tower (2x2x3 made with a 3x3x3 internal kernel)
Crystal Cube (remove corners and add cubies to centers)
Master Crystal Cube (add 6 cubies to each side, there are two on centers)
Russian Cube (shave top and bottom edges but leave middle edges and all corners)
Fisher Cube #1 or Diagonal cube
Fisher Cube #2 or Off-Center Cube (bandaged Fisher #1)
Octagon cube
Cuboctahedron (14 sided)
Fully Extended Cuboctahedron
Pillow Cube
Master Morphix
Octahedron
Star Cube
Triamese Cubes
Trajber's Octahedron
Truncated Cube
Rhombic dodecahedron
Typical bandaged cube (only one corner left unbandaged)
2x2x2 bandaged

Pyraminx

Bandaged Pyraminx
Tetraminx (Remove trivial tips)
Octaminx (Remove tips deeper into the puzzle
Star Pyramid (Add extra tips to the middles pieces)
Spiny Pyramid (Add extra tips to the edges and trivial tips)
Pyraskewb (build up into a cube)

Megaminx

Siamese Megaminx
Megaminx ball (made by sanding down into a sphere)
Pyraminx Crystal???

Square One

3 layer Flower (put only corners in top and bottom layers and build up middle to match)
2 layer Flower (remove middle layer instead)
Barrel (put only edges in top and bottom layer and cut middle to match)
Master Square One (Add extra layers on top and bottom)

Skewb

Icosahedron
Siamese Skewb
Container
Mental Block
Nova
Para Skewb
Pillow Skewb
Pyracue
Skewb Star
Rhombic dodecahedron
Tetrahedron or Halpern-Meier Pyramid
Octahedron
Skewb Ultimate
Skewb Ball
Master Pyraminx???

2x2x2/Pyramorphix

Star of David or Starburst (put only corners on Pyramorphix)
House
2x2x2 Balls
Staircase (add extra cubies)
Rhombic dodecahedron
Gem or Octahedron (put only middles on Pyramorphix)

Rubik's UFO

Cheese (buildup)

what's the diffrence between between 9 and 10 on the 4x4x4 bandaged variations?

Someone mentioned the possibility of building up the UFO into a cute little junior version of the Masterball.

Also, the tetraminx is for sale at mefferts, no?

The Wall cube (#10) is stickered in such a position that the sides of the puzzle look like a staggered brick wall when solved. When in solved position, you cannot turn a vertical layer without first turning the horizontal layers. On the 2x3x4 (#9) you can start with the solved position and turn a vertical slice. They are the same puzzle but stickered differently. If you took #10 and turned U'd' then you would have the puzzle in the state that is considered solved for #9 and vice versa.

Built up from a rainbow cube.

Also known as Christoph's Jewel. Make it by removing the trivial tips on a Magic Octahedron.

The 2x2x2 mechanism can be built into almost any shape imaginable. Commercially there are more 2x2x2 puzzle heads (Star Wars, Looney Tunes, etc.) than I care to count.

Doug.

Or add trivial corners to the Magic Jewel to make an Octahedron puzzle.

Doug.