This is pretty cool. Just got mine the other day.

It's due to the coordinating work of
John Scalzi and many other authors, editors and the various folks involved with the
Hugos and Anticipation. What is it? The Hugo Voters Packet. It's a collection of sample works from nominated writers. It comes in various formats, including pdfs of entire novels. (See below for the complete list of available materials.) I know that Doubleday offered a complete pdf of
Acacia: The War with the Mein for the Campbell category. You'll find the same offered from all the Best Novel candidates (except for Neal Stephenson). The idea is that it's the best way to make sure voting members of Worldcon have access to the nominated materials of as many of the writers as possible. It's meant to encourage voting, and - better yet - to facilitate informed voting.
Thing is, it's also a pretty big perk to membership. Joining is $195 US/$250 CAD for attending membership (which means you plan on coming to Anticipation this August) or $50 US/$55 CAD for a supporting membership (which allows you to vote for the Hugos). Considering that you get rather unusual access to novels and stories in a rare format... Pretty cool.
Having said that, I should make sure I also say that you're not
buying these works. You'd be receiving them as a feature of membership. It remains very important that there be no copyright infringement. These would just be for your use and ownership, and if anyone betrays that it'll likely scuttle the whole thing in future. And you'd run the risk of - at the very least - stirring the ire of some formidable word smiths.

Anyway, you could get in on this yourself, you know? Join up! Read. Vote. Come up to Montreal! It's guaranteed to be great fun. Even if you can't go, though, it's a great way to take a step further into this community. Here's a list of the titles you'd get a look at...
Best Novel
Little Brother by Cory Doctorow (Tor Teen)
The Graveyard Book by Neil Gaiman (HarperCollins)
Zoe's Tale by John Scalzi (Tor)
Saturn's Children by Charles Stross (Ace)
Best Novella
"The Erdmann Nexus" by Nancy Kress (Asimov’s Oct/Nov 2008)
"The Political Prisoner" by Charles Coleman Finlay (F&SF Aug 2008)
"True Names" by Benjamin Rosenbaum & Cory Doctorow (Fast Forward 2)
"Truth" by Robert Reed (Asimov’s Oct/Nov 2008)
Best Novelette
"Alastair Baffle's Emporium of Wonders" by Mike Resnick (Asimov's Jan 2008)
"The Gambler" by Paolo Bacigalupi (Fast Forward 2)
"Pride and Prometheus" by John Kessel (F&SF Jan 2008)
"Shoggoths in Bloom" by Elizabeth Bear (Asimov's Mar 2008)

Best Short Story
"26 Monkeys, Also the Abyss" by Kij Johnson (Asimov’s Jul 2008)
"Article of Faith" by Mike Resnick (Baen's Universe Oct 2008)
"Evil Robot Monkey" by Mary Robinette Kowal (The Solaris Book of New Science Fiction)
"Exhalation" by Ted Chiang ( Eclipse Two)
"From Babel's Fall'n Glory We Fled" by Michael Swanwick (Asimov’s Feb 2008)
Best Related Book
Rhetorics of Fantasy by Farah Mendlesohn (Wesleyan University Press) What It Is We Do When We Read Science Fiction by Paul Kincaid (Beccon Publications)
Your Hate Mail Will be Graded: A Decade of Whatever, 1998-2008 by John Scalzi (Subterranean Press)
Best Graphic Story
Schlock Mercenary: The Body Politic Story and art by Howard Tayler (The Tayler Corporation)
Best Dramatic Presentation, Long Form
METAtropolis by John Scalzi, ed. Written by: Elizabeth Bear, Jay Lake, Tobias Buckell and Karl Schroeder (Audible Inc)

Best Semiprozine
Clarkesworld Magazine edited by Neil Clarke, Nick Mamatas & Sean Wallace
Weird Tales edited by Ann VanderMeer & Stephen H. Segal - Year in Review
Best Fanzine
Argentus edited by Steven H Silver
The Drink Tank edited by Chris Garcia
Electric Velocipede edited by John Klima
File 770 edited by Mike Glyer
Best Professional Artist - Art samples by:
John Picacio
Best Fan Writer - Writing samples by:
Chris Garcia
John Hertz
Cheryl Morgan
Steven H Silver
The John W. Campbell Award for Best New Writer - Novels and/or writing samples by:
Aliette de Bodard
David Anthony Durham
Felix Gilman
Tony Pi
Gord Sellar
Labels: Award Stuff, Hugos, John W. Campbell