Is AirDrop possible between iPad, iPhone and MacBook? A new MacBook came with something called AirDrop and worked between many MacBooks such as MacBook Pro and MacBook Air. Can I also use AirDrop to exchange data between Macs and iOS devices?
You cannot use AirDrop with iOS devices. It is a feature that is exclusive to supported Macs (and unsupported Macs through a hack, as you've pointed out).

If you are interested in sharing files with your iOS devices, I recommend a solution such as SugarSync or DropBox, or a Wi-Fi tool such as Instashare.

Apple intends for you and developers to use iCloud to get documents from PC to iOS, but it's not widespread yet and perhaps ever.