Freetronics is Australia's answer to a lot of electronic tinkerers' needs, selling items like Arduino compatible boards, cables, and specialized tools. Founder Jonathan Oxer is a (serious) electronics hobbyist himself; he talked with Slashdot last year about making ArduSats, which were then launched to the International Space Station. Now, Oxer has written an excellent guide for hobbyists who might get the chance to travel to Shenzhen, where so many of the world's electronic bits and bobs are made. As travel writing goes, it's fascinating for the sheer novelty of the place. If you actually have the chance to go, some of the advice here might save you money and time. For those of you who have been to Shenzhen, what else should visitors know?