Right now I really really love "The Naked And Famous" from New Zealand. Their song Young Blood is really good, but I also like Serenade and All of This and... well, pretty much all of their songs actually.
Donkeyboy from Norway is another band I like. Their whole album "Caught In A Life" is really good for just sitting and thinking, in my opinion. Also some songs like Face Up, Pretend and Lions by electro pop singer Lights, lots of stuff by Sophie Ellis-Bextor, Savage Garden, Ladytron, Kerli Koiv, ... etc etc.
It all depends on what kind of music you like of course, but those are some of my own big ones.