Bruce Schneier just died a little inside
walmart.com
walmart.com
And for most attack scenarios for the private user, "a logbook on the desk next to the computer" isn't a big difference to "little bits of paper in the wallet".
Nowadays complex passwords on sticky notes stuck to the monitor isn't terrible practice. A physical notebook you can take with you is probably safer than just about anything else.
But like other posters, this is not that bad an idea - if your total value of passwords is say your savings account plus a bit, then you will look after that book about as much as you would a wallet with a couple of grand in it. Walking around with that much cash is not crazy man behaviour
Although I would like some arduino based keypad and display just for my passwords so I could carry it around. My laptop is never where I need it for that last password.