Ruby compared to Perl, Python. In English and German. Many links, review, comparison to other languages, code samples. Many useful, interesting scripts, patches, extension modules, and documentation. Interview with Programming Ruby authors.
Book is available as downloadable HTML and XML files.
The last two combine text examples with the online interpreter to run them. For discussing Ruby language and developing code. A wiki on Ruby, written in Ruby, with separate and intermixed Japanese and English pages. Whether you speak Japanese or English, you can edit these pages. Japanese is displayed with EUC encoded Japanese Kanji Characters.