Published 2008, available online. Part of the 'Sequences'. Apparently not all his fiction is on his main site under Fiction :(
First read (May 19th 2012)Edit
Online, 18472 characters, putting it at 10 'standard' pages.
Read it on May 19th 2012, after looking at Yudkowsky's latest comments on LessWrong and seeing one with just a link to this. The name intrigued me, and it turned out to be an interesting sort of short story, but part of his 'Sequences', so intended to be instructional.
I thought it was a fascinating and compelling way of imagining the way a trapped AI might escape its confines with incredible ease, and how it might see us. Bravo!
Second read (September 11th 2012)Edit
It had returned to my consciousness a couple of times since first reading it, and on the 11th of September 2012 I was looking at short stories on the wiki and reread this one.