MACUL) Conference. With this app, I was able to "send" a photo from my iPad to over 75 people instantly.
While there are other apps that can accomplish the same task (Bump, PhotoSynch), Chirp.io does it in a way that others do not. Chirp.io uses sound waves to transfer the files.
Imagine this scenario: you want all of your iPad/iPod Touch/iPhone holding students to visit a website that you have selected. You can have them launch Safari and enter the URL, or, you can send them all the link via Chirp.io.