How to send large files to someone, the right way

You really shouldn't be sending anyone large files through email (unless its a Gmail account or something similiar). Most users using an ISP mail account will have some limit on the size a single email can be - usually somewhere between 2Meg - 8Meg. What you should be doing is using a service like one of the one's listed below.

These online services will send the person an email stating a file is awaiting them for download. Now they can download it when they want, and if they want, without it being forced upon them.

You Send It: Files up to 1Gig
http://www.yousendit.com/

Send Over: Files up to 2Gig
http://www.sendover.com/

Mail Big File: File up to 1Gig
http://mailbigfile.com/

DropSend: Files up to 1Gig
http://www.dropsend.com/