I've actually been thinking about starting a similar thread myself, so thank you much for this.

Webcomics:

Weregeek, It's a fun little comic all about geeks. It updates pretty frequently and I never get tired of the art style. Word of warning, though, it's been going for about ten years now, so expect some changes, and good luck catching up to the current strips.
Wilde Life, I don't want to say anything too spoilery, so I'll must post part of the description from the website:
Oscar rented an old house off craigslist, then things got weird...
First it was meeting the ghost of a 1940s mathematician in the upstairs hallway, then it was finding a teenage werewolf in the bathtub. Now Oscar doesn't know what will show up next. Maybe that's okay, as long as nothing eats him.

Interesting, no?

YouTube channels:

Miracle of Sound, my all time favorite musician.
Skallagrim, Lindybeige, Schola Gladiatoria, and Metatron are all good sources for information on medieval combat. Very useful if, like me, your primary field of writing is high fantasy.
Every Frame A Painting, an interesting look into the styles of various directors, as well as videos on other aspects of cinema.
Mad Munchkin, the art, opinions, and perspectives of one Amy Methven.

The rest of my recommendations can mostly be summed up by the music rec thread here.

Go check out Paranatural- it's a really fun and quirky comic with awesome characters about fighting monsters and being overdramatic.
Also, The Property of Hate (can't think of the link at the moment ugh) is the sort of thing that the PPC would gobble up. It's really fun and dynamic and all of the characters are wonderful. One of the main characters is a talking television with a British accent and a questionable fashion sense, and another is a sock puppet. It's just great in general.

I might be back with more later. :) Thanks for the recs, Alleb!