Kamikaze Midget said:
So I picked up the first, and loved it.
Now the second is out, but I know almost nothing about it (save that all the monsters are new, and that there's a lot of them).
So, what are some examples of the stuff that'll be in there?
Before I get into answering your questions...here's the ToH2 preview, if ya haven't seen it:
http://www.necromancergames.com/pdf/toh2_sample.pdf
Now, onto the questions....
Demons, devils, undead, etc.

Examples....how about the Crucifixion Spirit, an undead creature that pulls an opponent's soul from its body and basically nails it to a translucent cross in front of its friends? The Murder-Born, an undead formed when a pregnant lady is murdered (the murder-born is the spirit of the unborn child). It has the ability to lay a curse on a foe that induces an XP penalty.
Hellstoker devils - stoke the fires of Hell and Infernus (Lucifer's plane where he went after leaving Hell). They fight with large bellows which can shoot fire (if they light them with their burning hands ability).
Time Flayers - powerful outsiders from the Plane of Time. They have the ability to push an opponent forward in time for a few rounds (thereby removing them from combat). Oh yeah, if you are slain by a time flayer, you suffer the Unmaking ("No memories or recollections of the unmade creature exist anywhere in reality. Past events the creature was responsible for are now attributed to an unknown—even if they recently took place. For example, suppose a great hero saved a kingdom from certain doom and then suffers the unmaking. The kingdom is still safe, but no one can quite recall who saved it.")
Just a few examples, there are a few hundred more in the book.
Is it as thick as the original?
Nope.
Yes- everything about the monsters is 100% OGC: names, text, abilities, descriptions, etc. The only thing I closed in the book was certain Proper Names (such as the name of Lucifer's palace which is mentioned in Xaphan's entry...who btw, tried to set the Heavens on fire before being cast into Hell).
Are all the drawings B&W sketch-style like in the original, or have there maybe been some improvements in theh area?
Black-n-White. Wouldnt have that 1e feel if they werent.

Tons of improvement. The art is a lot more solid this time. And there are one or two demons/devils (female) that are really hot (no pun intended).
Am I going to be looking at 30 pages of demons and devils again?
Nope.
Has this made any leaps and strides, or is it the same thing, with new beasties?
I personally think its better than the first one. Yes, the first one opened a ton of 1e monsters into the world of d20, but I just generally feel, new monsters or not, that ToH2 kicks ToH1's ass. New monsters, better artwork, more solid monsters with much more "fluff" text. Better layout....just a better book all the way around.
You want it.