The MeArm is an Open Sourced Robot Arm. It's small, like pocket sized and that's for a reason. It can be cut entirely from an A4 (or more accurately 300x200mm) sheet of acrylic and built with 4 cheap hobby servos. It's live on our site for about $35 or £25 for those in the UK. All the files are linked on this project page and hosted on thingiverse. It supposed to be an educational aid, or more accurately a toy. It still needs some tinkering but is at a good first draft state. There will be more instructions coming and no doubt more tweaks too.
Please get involved, build your own, break it, improve it and break it again.