well, if you would define last as being able to sustain a certain level of mainstream/commercial success without fizzling out or having a low fanbase, then
Muse - growing in fanbase and popularity, though not really mainstream radio stuff, at least in singapore
Franz Ferdinand - after the radio hit Take Me Out, FF has a few other mainstream releases under their belt and a large fanbase and increasing popularity, looks like they'll be around in the pop-rock scene
Audioslave - after their second release, they look to be getting more confidant of themselves and are breaking out of the RATM/Soundgarden mould and shaping a more unique Audioslave sound