dtgreene: Actually, if it works the way the manual my character found, it will take you to the midpoint of the next level, allowing you to potentially get nearly 330k experience. Notice how my character got nearly 450k experience from a manual.
stryx: Did you identify it? What kind of manual was it?
Gwenno also found Manual of Gainful Excercise, which increased her strength by one. The Manual of Puissant Skill at Arms brought her to the beginning of her next level, although I'm not entirely sure whether it is supposed to work for a bard.
Unfortunately, I don't remember what the book was called.
Out of curiosity, have you found Vampiric Touch? Have you been using it?
The Lost Helm of Midnight gives a free True Seeing effect, so I no longer need to keep casting that spell and can replace it with a second Flame Strike. My ring of regeneration speeds up resting (I used a scrying glass to identify it and my ring of shocking grasp for convenience.)
Rings of Adornment are Gold in this dungeon. (Easy way to identify them: they don't change color when Detect Magic/True Seeing is in effect.)
Found a manual that raised my Dexterity to 19. I have 19 Wisdom thanks to a ring. Still only 18/00 strength, but that Ring of Shocking Grasp makes up for it.
For whatever reason, on the previous floor, Flame Blade did only half damage to Trolls.
Shambling Mounds on the next floor, which give a lot of experience IIRC.
-4 AC. Not as good as the previous character, but then again, there's no level draining undead in this dungeon to worry about.
One other observation: There's no cooldown after using wands, so if you're desperate, you can rapid-fire any offensive wands you have. (I have 3 wands of lightning. Note that they auto-identify if you use a charge from one.)
Found a potion that healed 9 HP. Decided to drink it right away (which should auto-identify any more I find) because of limited inventory space.