WeTransfer

With the demise of Drop.io, many of us are looking around for a free file transfer service. WeTransfer, at https://www.wetransfer.com/, offers a free service where you can send up to 20 people a selection of files up to a maximum of 2 GB in size. They’ll host the files for up to two weeks. The 2 GB file size limit is per transfer, so after sending the first 2 GB, you could start over and send another 2 GB of files out.

To use it, you don't even need to register. Just upload the files, input the email address the files are going to, followed by your own email address. You also hav the option to add a personal message to the email.