The SIM Card Spy will suck the data out of a SIM card on to a PC. It's $149.
UPDATE: Noen found a similar gadget that seems to do the same thing for just $19.
Have you ever wished you can spy on your wife, husband, teens, or colleague phone to see what they are up to? Are they being suspicious when on their cell phone? This SIM card spy software and hardware solution can tap into all files on a cell phone SIM card for viewing, saving or editing. Simply place the SIM card into the USB reader, and with your computer, instantly save for later or view immediately. Backup your mobile phone numbers and SMS messages to your PC, another SIM card or any removable media.Link
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects