Next time you find yourself stuck on a long train ride, don’t just stare out the window or try to steal glances at your seat-mate’s newspaper. PlaySay, a new online tool for language learning on the go, will help you make the most of your downtime. Unlike other vocabulary-building programs, PlaySay provides interactive audio-visual flashcards that you can customize into personal playlists for your iPod, cellphone or other device. Once logged on to the site, users purchase “credits” that can be redeemed for a variety of playlists, including katakana and JLPT vocabulary or others based around popular textbooks like the Genki series. All lists can be shuffled, tagged and sorted, and everything is viewable in English-Japanese or Japanese-English. PlaySay also hosts files for English-speakers learning Chinese and Spanish, with several more language versions in the works.