SCORE: 5 / 5
NOTE: THIS APP IS ONLINE ONLY!
If you own an iPod Touch, this app is indispensable. IM, Text, send attachments, and more to anyone else on Wi-Fi using Bump. Have a calendar event or a contact that you want to share instantly with the person next to you? No problem, just attach your desired stuff and "bump" your iPod to instantly send whatever you choose. Got something you need to send right away but the receiver is outside a Wi-Fi zone? Simply add that person as a contact, send your attachment, and the next time that person is logged onto a Wi-Fi network the information will be sent to them automatically.
RECOMMENDATION: Normally I wouldn't really bother reviewing the more popular apps in the iTunes store, but Bump is one of those you-can't-live-without apps and its usefulness (for myself in particular) have made it (for a free app especially) a phenomenal find.