I think I might have the most extensive list of 'favorites' known to man, when it comes to music. o.-
Buttt...I'll try to list off a few?
The Agonist
Barenaked Ladies
The Bloodhound Gang
Cinema Strange
Puscifer
Static-X
Toybox
The Trans-Siberian Orchestra
Voltaire (no not the poet)
Black Tape For A Blue Girl
Skinny Puppy
Abney Park
Emilie Autumn
Avenged Sevenfold
Disturbed
Flogging Molly...
And that's all I can think of off the top of my head at the moment.

My favorite artists are just as varied. x_X