My house is full of things that use the Linux kernel, and many of these use BusyBox to provide functionality. I decided to catalogue them because, frankly, I'm dull.

Computers

• Ghetto laptop HTPC thingy (as seen on this blog in the past)
• Our five year old Toshiba laptop
• My Dell laptop that I use for work-related shenanigans
• My aged Asus Eee 701
• My even more aged, not turned-on-for-four-years-yet-it-still-takes-up-space desktop PC dual boots to Ubuntu 6.06 - so old I can't even remember the animal name.

Not computers

• My Android phone (an HTC Desire)
• Our Amazon Kindle
• My Chumby One
• Our TV. LG uses Linux for the firmware; you can get a copy of the source on request. There's a serial port on the back which, far from being a debug-only affair, can actually control the TV. The manual even lists the commands to send it to achieve this.
• My cheap Emprex 'PVR' thing. I got it mainly for recording stuff I want to keep off our Sky+ box, but it's actually a (to be fair, pretty limited) Linux device.
• A Linksys WRT54G router - although I've promised this to @Nermal
• A Linksys NSLU2 NAS "thing", which has been superseded by...
• A Pogoplug (both do the same thing - share USB drives over the network - but the Pogoplug is significantly more powerful, while drawing less, erm, power).
• My Dingoo A320 is rocking Dingux - allows for a load more emulators and games.
• Our Wii has been upgraded with a WODE - which runs Linux on its tiny parasitic board (to the point where it favours an ext2 file system).
• And finally, somewhere in the house I've got a Juicebox that I started hacking and gave up on because my solder skillz were too lacking at the time.