Who is the best VOCALIST???

Also I would add:

Trent Reznor ( I really don't give a shit about what are you thinking about him)
Maynard James Keenan
Tori Amos :D
David Bowie
Layne Staley
Steven Wilson
Mikael Akerfeldt
David Gilmour
Garm
Dave Gahan
Robert Smith
Chris Cornell (in his Soundgarden days)
Robert Plant
Geoff Tate
Barry White
Bruce Willis
Abbath
Jim Morrisson
Tarja Turunen
Serj Tankian
James LaBrie (well, fuck you, I don't care about your opinion)

These are my favorites atm...
 
I feel i must add Mr Phil Anselmo to this list a truely great vocalist

I also agree with a lot of the last post
 
I don't know if it's been mentioned but Myles Kennedy kinda takes the cake on this one for me right now. Other than that, I have to agree with James Labrie and Freddie Mercury, since we're talking greats here, though Matt Barlow should be mentioned too.
 
Hahahah I browsed this thread and noticed I've already posted, in 2002 :D The years just fly by!!! Back then it was Patton, nowadays I'd go for Chris Cornell, tho. Euphoria Morning and Temple of the Dog should do the trick.

edit. Oh, nice to see Myles Kennedy mentioned. He's a kind of mixture of Michael Kiske and Chris Cornell! Could be worse, eh? :)
 
Here's a couple.

Devin Townsend
Russell Allen
Heather Findlay
Freddie Mercury
Tori amos
Jari Mäenpää
Anneke van Giersbergen
Tim Bowness

There's many obviously fantastic vocalists I'm not mentioning, but it's about the personal impact of the vocals that matters. Plus the fact that I have never listened to music on a search for the greatest vocals so my knowledge on singers is more limited than with guitarists or drummers for example.