So, seems like it will be every two weeks a new book bundle.

Humble eBook Bundle IV

PWYW for:
Wizzywig: Portrait of a Serial Hacker by Ed Piskor
March: Book One by Congressman John Lewis, Andrew Aydin, and Nate Powell
The Sword & Sorcery Anthology by Various, George R. R. Martin

BTA for:
From Hell by Alan Moore & Eddie Campbell
Wizard's First Rule by Terry Goodkind
The Alchemist by Paolo Bacigalupi
The Executioness by Tobias S. Buckell

$10+ for:
Jam by Yahtzee Croshaw
Lovecraft's Monsters: Anthology by Various, Neil Gaiman. Ellen Datlow, Editor

I thought they had Jam in an earlier bundle.

I have the three first eBook Bundles and Jam is not there. Mogworld was in the eBook Bundle 3, though.

From Hell? Hell yeah!

Added to the BTA level:

From Hell Companion by Eddie Campbell & Alan Moore
Too Cool To Be Forgotten by Alex Robinson
Shambling Towards Hiroshma by James Morrow
Lawful Interception by Cory Doctorow (Audio Novella)

This time we have the Audiobook Bundle 2:

All in MP3

PWYW for:
- The Perfect Storm by Sebastian Junger
- Strip Tease by Carl Hiaasen
- Red Rising by Pierce Brown
- Grave Sight by Charlaine Harris

BTA:
- How Music Works by David Byrne
- Down and Out in the Magic Kingdom by Cory Doctorow
- Hollow World by Michael J. Sullivan
- Rules of Prey byJohn Sanford
- Baudolino by Umberto Eco
- Bearing an Hourglass by Piers Anthony

$10 to Unlock
- Fight Club by Chuck Palahniuk

Edit: Added Rules of Prey, Baudolino and Bearing an Hourglass to the BTA bundle.

Still one hour left for the Audiobook Bundle 2! Grab it, if you haven't done so already (and you're interested!).

Funny, I wanted to check how much money had they collected and the page reacts as if it's trying to go to paypal. Even if I wanted to buy it, it won't let me enter information. Tried in two different browsers.

It's $175k with 19k bundles.

If you really want the bundle, check with support! Maybe they can help! Hmmm. Not that much...but I mean, that's why bundles exist - to spread the word, not to make money...

Well, the way you phrased it sounded like it didn't let you check on those stats. My misunderstanding.

My point was the very strange behaviour of trying to reach paypal without any information being entered. That distracted me from my original query.

Nevermind, we have a new bundle and it's comics.

Indeed...

<span class="bold">The Humble Dynamite 10th Anniversary Bundle</span>

PWYW
My Little Phony - A Brony Adventure (One-Shot)
The Mocking Dead (Issues 1-5)
Vampirella Vs. Fluffy (One-Shot)
Chaos! #1
Amanda Hocking's The Hollows: A Hollowland (Issues 1-10)
Cryptozoic Man (Issues 1-4)
Sherlock Holmes, Vol. 1: The Trial of Sherlock Holmes (Issues 1-5)
Vampirella Masters Series, Vol. 1 & 2 (Issues 1-10)
Project Superpowers, Vol. 1 (Issues 0-7)

BTA
Jim Butcher's Dresden Files: War Cry #1
Legenderry: A Steampunk Adventure #1-3
Pathfinder: Dark Waters Rising, Vol. 1 (Issues 1-6)
Red Sonja: Queen of Plagues, Vol. 1 (Issues 1-6)
Kevin Smith's Green Hornet, Vol. 1 & 2 (Issues 1-10)
Vampirella Masters, Vol. 4: Visionaries (Anthology)
George R. R. Martin's Wild Cards (Issues 1-6)

$15+
The Dynamite Art of Alex Ross
Robert Jordan's Wheel of Time, Vol. 1 (Complete Collection, 36 Issues)

In addition:
"Dynamite is giving away a free issue for download each day of this bundle. Check back everyday at 11 a.m. Pacific for a new preview issue!" The first issue of Red Sonja is the current freebie.

All available "in multiple formats including CBZ, PDF, Mobi and ePub"

In the last Image Comics bundle, there were .CBZ, .CBR, regular PDF and HD PDF, apart from .mobi and .epub