1877 US in baseball; metaphorical usage from 1896, more generally from 1930. Since at least 1870, baseball teams would reissue tickets in case of postponement due to rain, which became known as rain checks.
Update: In fact, the latest update of iPhoto is using Helvetica Neue. And now there's Avenir, a Linotype typeface and Apple's new favorite. It was designed by Adrian Frutiger in 1988, inspired by two old school typefaces created in the 20s: Erbar by Jakob Erbar and Futura by Paul Renner.
Open Sans. Open Sans is a sans-serif typeface designed by Steve Matteson and commissioned by Google. According to Google, it was developed with an upright stress, open forms and a neutral, yet friendly appearance and is optimized for legibility across print, web, and mobile interfaces..