RESTduino is a simple sketch that lets you talk to the Arduino using easy REST-like HTTP requests.

"If there are more than five bikes at one of these bike stations the relevant LED comes on. It's a glanceable guide to which way to walk when we head out."

The Arduino microcontroller is a malleable tool used in art and design. Started as an educational prototyping tool it contiues to expand due to the thriving community and open source nature. Because open source initiatives allow for modification, derivatives, and sharing of intellectual property, artists and designers can evolve new Arduino-based microcontrollers specified to their work.

Looks like he is parsing RSS feeds with PHP and pushing them out to Arduinos with LCDs.

Narcoleptic – a sleep library for Arduino. It provides a new delay() function that drastically reduces power consumption from 15mA down to practically zero (around 1µA). If your code spends 99% of the time executing the Narcoleptic delay() function, you could reduce your current consumption by 99% too.

bildr is a community driven site for Artists, Designers, Makers, Builders, or anyone interested in the world between electronics and code.

tons of info and sample code for interfacingthe AD7746 with Arduino

sample code for interfacing a touch sensor to the arduino

Gadget Wrangler at Bug Labs

This box is a GPS puzzle build as a wedding gift by Mikal Hart. It only opens when it's in a specific location, and the puzzle involves discovering just where that location is.
The box has a button and an LCD display on the lid. When you press the button, the display will show you how far, in kilometers, you are from the goal location. It doesn't give you directions, so you need to triangulate where you're supposed to go via trial and error. Oh, and you can only press the button 50 times.
There's a pretty sweet disguised back door built-in as well, just in case the battery dies or the GPS unit fails.
Spoiler: the box only opens when brought to Île-de-Bréhat, France. As for what's inside?
With all the electronics, there wasn't much room inside the box for anything too substantial. I put in a few local (US) gift cards to entice them to visit soon, a set of Kazuo Ishiguro audio books (on a USB key), and an overly sentimental card. And of course, as I pointed out in the card, if either of them fancies doing a little Arduino development, there's a perfectly good Duemilanove to play with, not to mention an LCD, a servo, and a GPS.
I guess the puzzle itself is present enough, really. Pretty cool stuff, no? [Arduiniana via Make]