Whatever happened to…?

I was surfing around on YouTube this morning (while keeping an eye on my daughter to ensure that the crayons are only used on her paper and not on, say, the walls and carpet) and ran across some music videos for Staind. I enjoyed some of their music when I was in college and realised that I haven’t really heard anything about them since. Not only that, but System of a Down (which, though their politics were sophomoric, had some interesting music) and some other bands. Whatever happened to these guys? Did the bands break up? Did they release albums that bombed and then they faded away?