Google announced today that it is adding some new integration options to Google+ Sign-in.

Google launched Google+ Sign-in in February as its latest answer to Facebook Connect and the Open Graph. Now, Google has added Janrain and Gigya to its roster of partners that are integrating Google+ Sign-in as part of their product suites.

In a post on its Google+ Developers blog, Google says, “This means that their customers will be able to: Add trusted authentication to their apps and sites, allow web users to automatically download their Android app, customize their app experience using Google+ profile info, enable users to share interactive posts with friends, and write app activities that only appear when they’re relevant.”

Janrain customer sites include: NPR, Universal Music Group sites (including LadyGaga.com, JustinBieberMusic.com, Eminem.com, etc.), and HSN. Gigya’s include American Idol and Food Network UK.

Google’s initial launch partners included: Banjo, BeautyFish, Fancy, Fibit, Flixster, The Guardian, OpenTable, Shazam, TuneIn and USA Today.