I was a bit flabberghasted today when a friend told me in an email that when he acquires second-hand books he sticks them into the microwave for a couple of minutes to sterilise them and kill the silverfish!* The latest book to undergo the process was an autographed copy of Vikram Seth's A Suitable Boy and there was apparently no damage done. (This same bloke used to freeze them to kills the bugs before he thought of zapping them.)
Some time back on the Guardian blog Chas Newkey-Burden described his queasiness at dealing with other folks DNA deposits among the pages and those "mucus moments".
It's something I've never given a thought to until now. But I won't be cooking my own books, 'cos knowing my luck I'd probably set the house on fire!
(*See also Yahoo answers on the subject.)