A great standalone ftp server !

I suggest using TypSoft Ftp server, I use it to transfer files between computer without configured network, and it work great. It even support resume and others greats features.

TypSoft Ftp server
http://en.typsoft.com/

For a basic one ( only 116KB) try Baby FTP Server. it work great but has no resume.

http://www.pablosoftwaresolutions.com/html/baby_ftp_server.html

To find hundred more portable software, go to:
(until this site database is completed)
standalone.atspace.org
portablefreeware.com