Google Glass is neat, but it's currently short on third-party apps because Google hasn't opened up the Glassware app ecosystem yet. While we wait for that to happen, the data sync service Zapier has added support for Glass that connects it to over 200 online services.
Zapier is based around triggers and actions. If you've ever used ITTT, it's a similar idea. Each "Zap" is basically used to make two services interact.