Since madth3 isn't currently around, let me post the bundle in his place:
<span class="bold">Humble Books Bundle: Neil Gaiman Rarities</span> PWYW Adventures in the Dream Trade (essays, poems, lyrics and original AMERICAN GODS blog)
Gods & Tulips (controversial 1993 speech, an essay on running signings, and a speech on comics)
Free Speeches (speeches by Neil, Frank Miller, & others)
Being An Account of the Life and Death of the Emperor Heliogabolous (24 hour comic, written & drawn by Neil Gaiman)
Angels & Visitations (first collection of prose fiction, non-fiction, & poetry)
BTA Ghastly Beyond Belief (Neil's rare and never republished second book of oddball quotes)
Day of the Dead (fully annotated Babylon 5 script)
An Honest Answer & Other Stories (Bryan Talbot's collaborations & Dave McKean too)
Feeders & Eaters with Mark Buckingham (Neil's collaborations with Mark Buckingham, including a comic about Alan Moore)
Sweeney Todd & Other Stories (Neil's lost, unfinished, never republished graphic novel with Michael Zulli)
Neil Dreams (short comics of dreams, by and about Neil, done by & with Rick Veitch)
Seven Deadly Sins (controversial 80s comics anthology. Neil does sloth. Alan Moore does lust)
Outrageous Tales From The Old Testament (controversial 80s comics anthology. Neil nearly sent one publisher to prison. Alan Moore, Dave McKean, Dave Gibbons & more)
Sculpture Stories with Lisa Snellings (short stories & sculptures)
Blood Monster with Marlene N. O'Connor (a short story about monsters & the people who make them)
A Fall of Stardust with Charles Vess (a short story set in wall, with never before reproduced illustrations by Charles Vess, and three poems set in Stardust)
$15 Duran Duran (Neil's never republished first book, ridiculously expensive second hand)
Manuscript Found In A Milk Bottle (never before reprinted short story with brand new intro)
Love, Fishie (poems by Neil & Maddy Gaiman, a privately printed gift for his 42nd birthday)
A Little Gold Book of Ghastly Stuff (out of print & collectible book of short fiction, essays, poems, many never reprinted)
In addition, you can get the first issue of CBLDF for free.