Forget,
A few things:
Can you put them on CD / DVD and post them?
You can get various utilities that allow you to cut files up into chunks and get the recipient to re-assemble them - probably they have to have the "stitching" software too, but at least you can send several emails with smaller attachments!
Why not set up an FTP server? You then just email the URL to your files - size should not be an issue, assuming broadband to upload / download. Note that ADSL is a bit limiting here - as the A is for asymmetric, or SLOW to upload from your PC. But maybe you could get it hosted at ISP level.
With FTP you need to think carefully about security, authentication etc. - firewall ports need to be opened, accounts created to allow external users in, etc. etc. You do NOT want to set up an FTP server that allows anonymous login with the ability to upload files!
HTH
SD