Web comics:
xkcd cartoon: My Profanity Usage by Cause, link from DoctorOak Alex (I think). Replace "Mario Kart" with "Zelda" and you have me ;)
Left-Handed Toons (by right-handed people): An Open Letter to Subway, linked by
Textual Humour:
Cephalopod Surprise by Skippy, linked by
Harry Potter and the Deathly Hallows, condensed by
Videos:
I may just have to rent/watch Music & Lyrics. This video is probably the funniest 80s pop spoof I've ever seen. Linked by
Livejournal entries with YouTube embedded videos by other people:
Have you ever wondered about the source of the /dance emotes in World of Warcraft?, linked by
Xbox 360: The Red Ring of Death, linked by
Video of a little yellow dancing robot. WAAAANT! *dead of cute*
Actual Useful Content(!):
The Ikea Hacker, link from