Tell me about the speed improvements of file copying across a broadband link (PPTP, or direct connections to a Windows box on the internet with it's port 445 open).

If i'm VPN'ed to work, and i want to transfer 100MB: it is faster for me to Email it, or to copy the file to a web-server, or copy the file to an FTP server.

Isn't it time to improve the file sharing protocol, or to add a new file sharing protocol altogether? i could listen to an entire MP3 over an RDP link, faster than i could copy that same MP3. i know that SourceSafe2005 comes with a new 'file sharing service', so speed up file copying.

What is Vista doing for me in this area?