For those who are interested, there's a file called LevelUpData_1.txt in the Oblivion folder that contains spell info. The last line lists the spells (and id numbers) in your book from your last level up. The console command
Player.removespell (ID NUMBER) can be used to erase unwanted spells.
[ 04-25-2006, 07:52 AM: Message edited by: Sever ]