Camino :
Most of the serving user's DO have a dynamic IP.
Thats NO problem
Visit
H*tp://www.no-ip.com
H*tp://www.dns2go.com
just to mention a few FREE domain provider's, letting you download a
small client that update's their DNS with your current IP at regular basis.
Then U can host a server, using a domainname, ie myftp.isthebest.com