Potato is a Squeak virtual machine completely written in Java. It is a derivative of JSqueak (http://research.sun.com/projects/JSqueak/) which was developed by Dan Ingalls. There is a blog on the project at http://potatovm.blogspot.com/.
It is a project to bring squeak into any j2me mobile phone capable. It is based on potato project that is bases in jsqueak a java version of squeak smalltalk virtual machine.