Are you careful with the spines? Or do you crack your books open to make them lay flat?
Careful? Definitely. My books tend to still look almost new when I'm finished with them.
Do you use bookmarks? Or do you fold the corners? If you do use bookmarks, do you use those fashionable metal ones? Or paper?
Hate folding of corners. I will use a bookmark if one is within range, else I will use whatever handy piece of paper is lying around.
Do you write in your books? Ever? If you do, do you make small marks, or write in as much blank space as you can find? Pen or pencil? Highlighter? Your name on the front page?
Not generally. I have been known to write my name on the front page, but rarely.
Do you toss your books on the floor? Into book bags? Or do you treat them tenderly, with respect?
See answer to first question.
Do you ever lay your book facedown, to save your place?
I will grab whatever piece of paper I can find and use it as a bookmark if there isn't already one.
Um--water? Do you bathe with your books? Hold them with wet hands? Read out in the rain? Anything of that sort?
Are your books lined up on a bookshelf? Or crammed in any which way? Stacked on the floor?
They are lined up on a bookshelf. Though at the moment they are fighting for space with my DVDs.
Do you make a distinction--as regards book care--between hardcovers and paperbacks?
No. Though I do tend to donate paperbacks which I don't plan to read again to the local library.