With YouSendIt you can email attachments up to 2GBs. Forget FTP sites and the hassle of uploads, downloads, zip, unzip.
The service lets you do everything via a simple email interface and anyone can receive the email with simple instructions on how to grab the attachment.
With YouSendIt now portable on U3 flash drives it makes for a nice addition to your U3 arsenal of software.
Source: U3 YouSendIt via YouSendIt