Yeah, some use RFID, some use barcodes
The RFID ones are rarer because nothing has RFID tags built in.

We postulated that you could also use them to keep track of your diet, as it could tell you how often you had taken beer or other such out of the fridge.
(PenguinOfDeath is Scottish, and most likely angry, Fri 12 Mar 2010, 12:30, 1 reply, 16 years ago)

I don't know if I could handle my fridge judging me
when I've taken out that last slice of cheesecake at midnight.
( Kitty v1.0 desperately naive, Fri 12 Mar 2010, 12:41, Reply)

Agreed
I frequently stash beer in my fridge that I have every intention of drinking within the next couple of hours. I don't want my enjoyment of a day interrupted by an electronic cry of "ALREADY?!"
(Darth Foxtrot A one-man army dedicated to making fetch happen, Fri 12 Mar 2010, 12:44, Reply)

I've already got Wii Fit
telling my boyfriend it hasn't seen me in a while, I don't need it allying with the fridge.
( Kitty v1.0 desperately naive, Fri 12 Mar 2010, 12:48, Reply)

Sorry to bring up the one thing I know about you
but can't you just tell the Wii that when it lands a boyfriend who looks like Matt Bellamy, it'll be in a position to judge - and until then it can fuck off?
(Darth Foxtrot A one-man army dedicated to making fetch happen, Fri 12 Mar 2010, 12:54, Reply)