Gamer.no listed some voice actors in Mass Effect 2, unfortunately with no direct source, but seems to correlate nicely with the voices I've heard so far.
Martin Sheen - Cerberus leader
Yvonne Strahovski - Miranda Lawson, another Cerberus operative.
Seth Green - Joker
Keith David - Admiral David Anderson
Tricia Helfer - Normandy (the spaceship VI most likely)
Carrie-Ann Moss - Aria T'Loak, bandit leader.
Shohreh Aghdashloo - Admiral Shala'Raan vas Tonbay
Michael Hogan - Captain Bailey (silly site had spelled it Mikael at first)
Adam Baldwin - Kal'Reegar
Michael Dorn - Gatatog Uvenk.
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