Lacuna Coil's version of Enjoy the Silence (by Depeche Mode) is very good, plus Cristina Scabbia is hot hot hot! :). She does a good guest vocal on the version of  'A Tout Le Monde' on Megadeth's United Abominations album as well.
Evanescence I saw at Download one year (below Iron Maiden), and politely put, were definately a studio band not a live one! ;) Don't get me wrong, I like them, and Bring Me to Life was one of the best songs released in the year it came out, but she sucked the big one on the stage. Shame really, I was really looking forward to them too.