HDRI Quick Tip, and HDRI download
I came up with this nifty little trick earlier, and thought I'd make a quick video on it. If you're familiar with blender, you only have to watch the first 20 seconds. I'll sum it up here too, just parent your sun light and your world environment texture to an empty object, and then you can freely rotate both at the same time. Its simple, but I've spent a fair amount of time rotating HDRI's, then rotating the light to match it again, so, however small, this is definitely a timesaver for me.
Here's a link to the gumroad page for the HDRI.