Your favorite comedians past and present?

Lots of great ones but off the top of my head -

Past: Rodney Dangerfield, George Carlin, Richard Jeni, Redd Foxx

Present: Craig Ferguson, Bill Maher, Joel McHale, Bill Cosby (maybe not as active but still alive!)
 
Cosby for me is the greatest though.

Agreed. I gained a lot of respect for him when I went back to listen to his standup. He was definitely one of the best.

To be honest, I'm not familiar with standups nowadays. I don't watch as much as I used to. The last one I liked was Larry Miller.