We released a small gem allowing easy communication with Googles notification service for Android phones.
As we are developing both web applications and mobile applications, we often need to connect both together. However, we need to do this with keeping the restraints on a mobile device in mind, especially, battery power. Luckily, both Apple and Google offer a service to issue small notifications to a device registered with them; however, in contrast to the Apple service, there wasn't a solution for Google readily available, so we rolled our own.
The c2dm-rails gem enables a rails developer to easily send push notifications to multiple registered applications from a single rails application, following the guidelines of Google to not strain their services.
The source code is available at github, the gem itself is available at rubygems. Currently only for rails 3.1, a 3.2 version will released when dependencies are fixed.