For myself, I haven't found anything that I really like in the last few years. Most of the music I like is from 2005 or earlier but Mumford and Sons I can say has caught my eye.
My girlfriend has exposed me to a lot of house/dj music of late and it seems this more euro style music is gaining popularity in the US. To name a few producers/dj's that are popular, Tiesto, Avicii, David Guetta, Calvin Harris, Deadmau5 and Skrillix (dubstep). There is just a lot going on in this music with multiple melodies and other elements that can sound great if done properly. Here is a good example of this in levels from Avicii for anyone who hasn't heard the original. The people I know that are into this style music are all obsessed with this track.
The artist Gotye has recently become popular for one song and his music certainly is not traditional pop, but his song "Somebody that I used to know" has been blowing up the radio surprisingly and has nearly 200 million youtube views. Here is that song, but you might also want to check out some of his other tracks, they are quite unique if your looking for something different but it's not the type of music I would listen to.