Ear Worm/Web Comics

Examples of Ear Worms in Web Comics include:

This strip of Penny Arcade.
xkcd
- The page image comes from a strip that shows the bad consequences of an Ear Worm (Katamari while driving can be as dangerous as Burnout music).
- xkcd does it again while also riffing on Edgar Allan Poe: Presenting The Tell-Tale Beat.
This Questionable Content features Marten singing the Katamari Damacy theme after a Too Much Information moment from his mother, and:

Faye: Dammit Marten, now the Katamari Damacy theme will be stuck in my head all day.

Shinga, author of Head Trip, apparently believes that some Ear Worms are worse than others.
In the world of Yet Another Fantasy Gamer Comic, a certain song about the lady and the sausage maker is considered such.

Lucas: It took six months to get that tune out of my head. Two years to purge the imagery!

This Oglaf strip. (warning, NSFW website).
The Book of Biff shows us how to take care of an Ear Worm.
Helix from Freefall can't decide whether an Ear Worm is just a catchy tune or a computer virus.
The Dawn Chapel shows us even birds are not safe from Ear Worms.
This strip of Folly and Innovation.
A World of Fizz storyline involves Alex and Carlos (and later Dawn) repeatedly singing "Pants on the Ground", much to Kelli's annoyance, until she finds herself humming and singing the song^{[dead link]}.
General Protection Fault: Fooker has a very geeky version of an Ear Worm.