Kelly Clarkson - Shelter
She sang this Ray LaMontagne cover live on the React Now concert back in 2005. Since I haven't heard the original, I cannot compare the two. But Kelly seems to do a pretty good job with the song. The only problem is that: she sounded like she sang it for an American Idol episode, not like she really meant it.
Ted Leo - Since U Been Gone/Maps
Awesome tongue-in-cheek acoustic live cover from indie hispter Ted Leo. So yeah, he sang it ironically but it stills sound great. In fact, everything was sounding great then all of a sudden, after the riffs, he switched to 'Maps' by the Yeah Yeah Yeahs, which lead me to a shocking discovery: the riffs of 'Since U Been Gone' totally ripped off those of 'Maps'. Now that's a cover with a purpose.