Silly me. Elvis, when you go to your 'My Email Alerts & Searches', and click on 'My Trulia Voices Alerts', you get pages of your questions/topics and alerts. On the top column, you can select 'delete all' (red letters), that'd get rid of all your voice alerts.
Thanks for making me look at it twice. Now I just deleted all 600+ voice alerts.
And William, I am not quite sure about your problem as I am getting links to all my updates@Trulia answer alerts. I am trying something now. If it works, I will let you know.
BTW, I have an IT background, so you got me curious about this.