Many of you know that I'm a huge fan of Dropbox for sharing files among my many computers. There are many apps that work with Dropbox, and my favorite is AirDropper
. It solves one of the biggest problems with Dropbox: getting files from friends or clients who don't want to sign up for Dropbox. AirDropper lets you send the stubborn, Dropboxless target a link that they can use to upload files directly into your Dropbox. There's no separate account signup, and nothing to download.
If you'd prefer not to email the person, but would rather IM or Twitter them the link, you can check a convenient "I don't want to send them an email" box, and the link will be sent to only you. AirDropper also recently added support for sending multiple files at once, which makes it about a million times more useful.