Probably the most famous voice right now is Steven Blum. He's everywhere...commercials, anime(he's the English version of Spike Spiegal in Cowboy Bebop), and in a lot of games. Heck, he's the voice of Cartoon Network's Toonami. I can't remember the last voice actor who was this prolific....I hear him everyday.
He has over 150 entries on IMDB and this doesn't include the dozens of commercials he's done:
http://www.imdb.com/name/nm0089710/