Dropbox.com has become a great tool for syncing files across your own computers and sharing files with others. One of the most handy features is sharing a folder with another dropbox user. Just drag files over your Dropbox folder on your computer and it's automatically synced to anyone you're sharing the folder with. It's perfect for sending multiple files or large files without the hassle of email or FTP programs. You can sign up for a free account and receive 2GB of storage.