Hi all,
Yes, i must emphasize how good this singer sounds live. It is simply the best i have heard yet, and i believe others should try to hear this out too. Minimal electronics is one factor to take in account, it all comes down to her beautiful voice and the marvelous sound of the accompanying guitars. I also think that this kind of less complex music has very little room/venue interaction, at least not in the same degree as a rock/pop concert, leading to a seamless presentation and performance and lack of added distortion.
Hugh, it is truly a pity that you cannot understand the words, sometimes it is what makes you cry. It is not rare to see her (Mariza) cry on live performances due to emotions generated between the audience and herself and of course interpretation of the lyrics has a lot to do with it.
She even has a Live DVD concert, recorded in Lisbon with the its Symphony, where this happens in the very last song. It is, for me, the benchmark of a well delivered performance. Simply stunning, emotional, a must see. It is the same Concert as posted by LM above ... here is the link to THAT song : "Gente da minha Terra", which translates to "Oh people of my homeland".
http://www.youtube.com/watch?v=TeOhPR_0x8EI hope you can attend the concert. I have bought my tickets to her next appearance here in Porto, 3 weeks after the Australia tour, on October 30th. A marvelous way to spend my birthday !!

Cheers,
Filipe