My recent list was...
1. Daniel Gildenlow (Pain of Salvation)
2. Mariusz Duda (Riverside, Lunatic Soul)
3. Mikael Akerfeldt (Opeth)
4. James LaBrie (The Awesome Pwners Of Burning Doom Hidden In An Ethereal Basement Defended With Ion Cannons)
5. Bruce Dickinson (Iron Maiden, solo, Samson)
6. Jonas Renkse (Katatonia)
7. Nick Holmes (Paradise Lost)
8. Kjetil Nordhus (Green Carnation)
9. Rob Halford (Judas Priest, solo, Fight)
10. Fernando Ribeiro (Moonspell)
11. Steven Wilson (Porcupine Tree, solo, Blackfield)
12. Blaze Bayley (solo, Iron Maiden, Wolfsbane)
13. Vincent Cavanagh (Anathema)
14. Amanda Palmer (The Dresden Dolls, solo, Evelyn Evelyn)
15. Steve Hogarth (Marillion)
16. Maciej Taff (Rootwater, Black River, lots of others)
17. Bono (U2)
18. Bruce Soord (The Pineapple Thief)
19. Mille Petrozza (Kreator)
20. James Hetfield (Metallica)