Notes?

Alrighty, just curious what the random Notes I pick up every-so-often that lets me write them down, do? The only one I recall right now, is the one about the chair. I think I've found another before that let me write it down as well, but can't remember it.

Also, I'm not too far in. After I hit Nashkel, I generally go explore all the maps and do all the quests before heading to the Mines but, I don't mind spoilers so spoil away.

Thanks.