If you find yourself emailing large files frequently then you can save yourself tons of time with Tubes.

Tubes is a application designed to simply file sharing on the web that works similar to an IM program for your files. In order to share content with a friend or coworker you merely need to invite them to have access to your tube and drop the files you want to share in. Once you grant tube access to a particular person then an image of your Tube shows up on their desktop and files dropped from your desktop into the Tube are instantly be accessible to others who have Tube access.

This is awesome for those of that have work with others on projects and have to trade files constantly giving everyone an easy place to put the files where everyone else working on a project can have access to them. Tubes is a PC only application and can be downloaded for free from the Tube's website.