2x2: ES
3x3: New A III
4x4: ES (I have a QJ on the way from DX woo)
5x5: Screw Spring ES (Yes, it really is good. Springs from a 4 coloured pen).
Megaminx: PVC
360: Duuhhh, I wunda.
2x2: black Eastsheen
3x3: Rubik's DIY
4x4: black Mefferts with Cubesmith Textured Stickers
5x5: black V-Cube I got from Ton Dennenbroek
6x6: white V-Cube
7x7: white V-Cube
2x2:Black Eastsheen w/ 3x3 c4y stickers
3x3:Glow in the dark type C w/ Smooth tiles
4x4: Black eastsheen w/ black side and no purple side
5x5: White Eastsheen
6x6: White V-Cube w/ Florescent stickers
7x7: White V-Cube w/Florescent stickers
Megaminx: Mf8
OH cube: Old type a w/ smooth tiles
2x2: black ES
3x3: nowadays some strange diy (black), I think it's called Big Goose
4x4: mefferts, buying the mini qj in a week
5x5: black v5 with white core
6x6: whatever Bence Barát is not using at the moment
7x7: white v7
onehanded: black japanese speedcube (JSK), it' like 1,5 years old so it's only good for OH now
multi bld: blue type C, black type C, JSK, Big Goose (black), Big Goose (white), Rubiks storebought, Rubiks storebought modded, JSK clone, Rubiks storebought with studio edges (and sometimes I use black type F, Diansheng core with old type A cubies, and another modded storebought)
2x2: white ES
3x3: black Type A II or black Ghost Hand
OH: white Rubik's DIY or black Type A II
4x4: white QJ (not mini; it locks up a bit too much for me)
5x5: white V5
Pyraminx: white Edison with ball bearings removed (feels exactly like a Type A )
2x2: custom made from 3x3 XD
3x3: JSK
4x4: mefferts. I refuse to use QJs they cut corners bad.
5x5: v-blackie with white core.
6x6, 7x7: white v, because my whites are more broken in...
Here's my list. For me, about 90% of all cube and puzzle solves are just for fun and research to learn and master faster solving methods. Only 10% of all solves can be classed as "speedsolving".
So for that 10%, here it goes:
2x2x2: White ES (A black one is coming soon)
3x3x3: Black Ghost Hand
4x4x4: Mainly black ES combined with white QJ with tiles
5x5x5: V-Cube 5
6x6x6: No such cube, my YJ 6x6 is only for fun solving. I am waiting for a clickless V6 or a 6x6 form of the X-Cube 4 to change this.
7x7x7: V-cube 7
Other puzzles:
Megaminx: Black QJ MF8
Pyraminx: White Ebay brought type
3x3: type A. For both OH and 2H. Thats the very old original type A's from before they appended any numbers to the end of A.
4x4: mini qj (ordered today)
Thats all I got. Well I have like 8 3x3's but I only use those two type A's.
Edit:
Pyra: Mefferts