If I'm not mistaken, Daring Doo is the first "fictional" character introduced in the MLP-universe. And Pinkie's breaking the 4th wall, but into the other direction. Not that it surprises me.
Heheh, me gots a nice lil' idea for an image involving Pinkie Pie bursting out of a Daring Doo comic held by Rainbow Dash, her "momentum" subsequently propelling her out somebrony's computer monitor. ... heh, now if only I had the time to pull that off
...actually, the story is also available as a text-to-speech synthesized audiobook. Links are provided in the individual chapters.
Eh, sure, not everypony likes the synthetic voice, but if you can get around that, you can practically "read" the story on your mp3-player while simultanously, say, draw a comic, play a videogame, sit in a cramped train, go grocery shopping or lie down in bed with your eyes closed.