1) Wizards on entry into the game are given a spell book, for roleplaying purposes, item weight between 1 and 4lb's? Unsure, but I feel it should have some weight to give it credability as an IC item and not an OOC mechanic. A Wizard should never ever be without one, and it should be his or her most prized possession.
2) The book item is randomly taken from a small pool of types, that have different appearances depending on characters alignment, this is so they don't look so cookey cutter and generic between characters, the book's are not chosen by the players (because everyone will go for the bad ass one
). There are three pools that one book is randomly taken from, one pool for Good, one for Neutral, and one for Evil, with say 4 types of appearance for each pool. Good and neutral books are called 'Spell Book', evil books are called 'Grimoirs'.
2) Alignment shifts will result in evil players having what are essentially 'good books', or good players having 'evil spell books', adding to the system and a characters complexity because the spell book is unchanging and precious. Its not a mere book that the player just discards and re writes when he feels like it. It is with them throughout his or her life.
3) The spell book is dropped on death in the players back pack, or on the ground like a players weapon.
4) An automated script adds the characters name to the book on entry into the game world so you know this is a genuine spell book for that character and not a purchased book from a store. This is so that players will do everything they can to retrieve there own spell books after death and not just buy another from a store because its easier, but they also have the choice to buy from a store if there own book is lost, or temporarily stolen, they then work on getting it back, and can still legitimately cast spells from a roleplaying perspective. They can then choose to discard the purchased books if they like if they retrieve there own original book.
5) Sorcerers don't get them on creation, but players could buy them from shady merchants if they wanted too, so if you where a sorcerer who wanted to keep a loose collection of information this is how you could do it, also if you where a wizard and you lost your book this is also an option for you, but the purchased ones from the merchants look like generic purchased books and they don't have any of the appearances that a genuine Wizard spell book has from the wizard pools, they should be tagged with a different name and there is no system in place to rename the item for players. DM's shouldn't rename them either.
6) Anyone who becomes a wizard by taking the wizard class after level two can purchase a generic book in game from a merchant, but the generic book isn't 1gp, its expensive...cost unknown but I'd say at least 500gp, it is an essential tool for a wizard and is core to his or her class. This also discourages loosing it.