J Adam G:
Same here! The Visuddhimagga isn't anywhere to be found in full, and what I can find is quite deserving of its reputation for density approaching inaccessibility.
Visuddhimagga and Vimuttimagga are two different works, written by two different people.
Full version of Visuddhimagga is here http://thepathofpurification.blogspot.com, there's a link to PDF on the right.
Or for another translation at archive.org: http://www.archive.org/details/pathofpuritybein01budduoft. I can't remember where I got two other parts of that translation, google for them.