http://makezine.com/27/

The Robots have returned! MAKE Volume 27 features a special package with robotics projects for every age and skill level. They play music; they outwit your pets; they learn from their mistakes! In addition, we’ll show you how to build a special aquarium to keep jellyfish, create pre-Edison incandescent lighting, spy via the internet, and make a go-anywhere digital message board! All this and much, much more, in MAKE Volume 27.