The comedians you like on Youtube.

[Uncle Nutsy]

Let's see what your comedic tastes are. Video is required.

http://www.youtube.com/watch?NR=1&v=Fcja4WFFzDw&feature=endscreen

And some Billy Connolly because.. well.. nothing beats an old angry scot.

https://www.youtube.com/watch?v=Ji5kdUd3D74

[YorkNecromancer]

I like the following comedians (Warning: some of the language is NSFW):

Ed Byrne
http://www.youtube.com/watch?v=nT1TVSTkAXg

John Bishop
part 1 - http://www.youtube.com/watch?v=-xA31VgRzNY
part 2 - http://www.youtube.com/watch?v=Z6T81wPqAQM

Reginald D Hunter
On Batman - http://www.youtube.com/watch?v=8l1PMVvfjDM
http://www.youtube.com/watch?v=tuq8ZU2Uf_0

Bill Bailey
On Starsky and Hutch - http://www.youtube.com/watch?v=GM2gjQsm0Mo
On Geoffrey Chaucer - http://www.youtube.com/watch?v=btDkHi2uo_s

Celia Pacquola
http://www.youtube.com/watch?v=PWZxvMOm8p4

Dara O Briain
On homeopathy - http://www.youtube.com/watch?v=RstwLzikmvA
http://www.youtube.com/watch?v=0123R6vjIoE

Russell Howard
http://www.youtube.com/watch?v=Yk5eHwVNdiM

Frankie Boyle
http://www.youtube.com/watch?v=QvOQxeQKrdw
http://www.youtube.com/watch?v=UwgonJSaabA

Roisin Conaty
http://www.youtube.com/watch?v=Nx9Zf2bRh_0

Also, it's not YouTube, but SeanBaby is the funniest writer on the internet, bar none:
http://www.cracked.com/blog/worst-life-ever-the-story-of-kazuyuki-fujitas-skull/
http://www.cracked.com/blog/the-top-eight-oh-****-moments-in-mma/

[Necron2.0]

If this is a gauge of taste, here's one that reflects my temperament:

http://www.youtube.com/watch?v=fs5TlfXytzM

This one speaks to my geek side:

http://www.youtube.com/watch?v=wSqFqhUzutg

And this one ... well, this one just because:

http://www.youtube.com/watch?v=l3w2MTXBebg

[Edit] And this one too (mainly because I'm a LINUX/UNIX snob):

http://www.youtube.com/watch?v=njos57IJf-0

[Brakkart]

My contribution to funniest comedian has to be this awesome routine by Welsh stand-up comic Rhod Gilbert on the 2011 xmas Special of another great stand up comics show (Micheal McIntyre). I just about died laughing watching this, it hurt to breathe!

http://www.youtube.com/watch?v=DO5VjcoJtT8 (http://www.youtube.com/watch?v=DO5VjcoJtT8)

[Uncle Nutsy]

Nice, Brak. He had me hooked on 'rubbish presents'.