Love them or hate them (though I'm now mostly indifferent), Hanson are still around. Though they've evolved into a generic pop/rock band and have a cult following.
One thing I find suprising is that all are married with children and the youngest's around my age.

As for the Jonas Brothers, not into their music either and actually don't know much besides that their fan base is mostly teenage girls and they ruined Kim Wilde's "Kids In America" ("Kids In The Future") for some horrible CGI film a few years ago.