Most of the time it's just YouTube and last.fm (I want something similar to something I like or find something new I like - I go through similar artists).

A little less, but still a significant amount - Radio Garden, I have a handful of stations favorited (Shoutout to 'Radio is a foreign country', they're on YouTube and soundcloud as well among others), but sometimes I just "roll the globe" and point and check out what they have on in like, Ghana or something.

Another internet radio thing is SomaFM, though out of their stations I tend to stay on DroneZone the most for some great ambient picks.