I love Airdrop for the Mac, it allows me to send files quickly from networked computers. No thinking just dragging and dropping. Instashare finally brings this to iOS, so you are now able to just share photos/presentations/MP3's and more with your Mac. The app is free but does contain ads, if you want to get rid of the ads just pay the 99¢ and the ads are gone!
Check out how simple it is on this short video.