We didn't really have a dedicated place for episode downloads last season that was completely reliable. Fortunately, season two has brought a whole plethora of improvements for those that don't actually have access to The Hub. I remember having to wait literally all day for pony to hit youtube in 420p, we had 720p within the hour this time around.
Ponyarchive has a listing of all episodes in various levels of qualities. It also hosts different types of downloads, from torrent to direct.
Right now they have what feels like the best 1080p version of The Return of Harmony. I added the direct download link to the episode post, but for those that want a bit of variety in terms of quality levels/download types, hit up their page for it.