Try
http://madaket.netwizards.net/vtail/
There is a mailing list, be prepared for 50 or more messages a day if you subscribe.
There is also a book 'those incomparable Bonanzas' by Larry Ball, or 'Flying the Beech Bonanza' by John Eckalbar.
The first is a catalog of all model years and modifications, the second is a technical analysis and highly recommended. You can also read up the stories on
www.aviationconsumer.com
Dirk