Club 8

This is a Scandinavian guy-girl duo (Sweden, I believe).  They have a number of albums out (around five I think), and historically their sound has been an extremely mellow pop.  Here is an example of some of their earlier work.  Their most recent album, which was released earlier this year, is a significant shift in style; it's a lot faster and more danceable.  Unfortunately I haven't been able to find much of this most recent album online, check out this video of one of their songs from it.  It's really good, and I highly recommend checking it out if you like their style.