JustBeamIt is a beta service that makes transferring files a snap!
Drag and drop a file, < 2GB in size, into the drop zone (box with highlighted border). A link will show that you can send to share the file, and you should see the message "waiting for recipient..."
Once your recipient starts downloading the file, the progress will start moving. Do NOT close the page at any point until the transfer is complete, as this will stop the transfer.
After the transfer is complete, you will see the message “transfer completed!” You can now safely close your browser window.