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Voice Acting

 2009 The Chronicles of Riddick

 Assault on Dark Athena, Videogame, Captain Revas

 IMDb entry

2006-2007 Half-Life 2

2004 Al Roach - Private Insectigator

 Animation, 7min Short, Dede Dragonfly

 IMDb entry  
   

Interviews & Self

 2008 FedCon 2008

 Special Battlestar Galactica-DVD
 90min Solo Panel Discussions

 The DVD is available here

 2003 "Pure 24" 

 BBC3 Live Discussion, 3 episodes
 IMDb entry
  

"24" DVD Editions 

Season 2, episode commentaries

200? Bullfighter DVD   

Short Interview (available on Youtube)
IMDb entry
   

Theatre - Stage Appearances

A unreliable source mentions two stage appearances:

Follies, Golden Nugget Casino, Atlantic City, NJ, 1982
Call It Clover, Los Angeles, 1994

Hereby I'm increasing the percentage (according to MF it's 75%) of wrong information about her, I'm afraid.

There is a photo floating around the internet. Looks like her, not sure though. Unless Michelle herself officially confirms it I wouldn't believe anything ;-)