How do I find a my screen shots I took?

They're in C:\Program Files\Guild Software\Vendetta\

Named dump0001.tga, etc.

They are targa files. Readable by gimp(1), imagemagick(2), Photoshop and more. I like to use imagemagick's IMDisplay to view 'em and Gimp to edit and save 'em.

1: http://www.gimp.org
2: http://imagemagick.org/

"They're in C:\Program Files\Guild Software\Vendetta\"

New installations go to \Vendetta Online\, so screenshots will be in:
C:\Program Files\Vendetta Online\

Hmm. I never knew that.