Arduino Leonardo support and multiple translations.
The biggest additions are support for the Arduino Leonardo and translation of the Arduino development environment into multiple languages. We’ll be doing a blog post on the Leonardo soon but, for now, see its getting started page and hardware page.
The translations were the work of many people, particularly Shigeru Kanemoto (who internationalized the software and translated it into Japanese) and David Cuartielles from the Arduino team (who coordinated the translation process). Languages in Arduino 1.0.1: Arabic, Aragonese, Catalan, Chinese Simplified, Chinese Traditional, Danish, Dutch), English, Estonian, Filipino, French, Galician, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuaninan, Marathi, Norwegian, Persian, Polish, Portuguese – Brazil, Portuguese – Portugal, Romanian, Russian, Spanish, Tamil. (For details or to help with the translations, see this page on the playground.)
For more detail: Arduino Leonardo support and multiple translations.