Transfer large files between two Macs over the web

I would like to transfer a number full quality photos from a DSLR between two computers located in different states. Both machines are Macs, running Tiger. I would prefer a direct transfer method rather than breaking the files into email messages, which would be quite time consuming given the size of the files.
What is the best way to accomplish this? If the two machines were on the same local network it would be easy, but they are not so simply enable file sharing doesn't solve the problem (as far as I know). Can I enable FTP access on the host machine and access if from across the web? How would I figure out the proper address from outside the local network (assuming NAT is used on both ends). Is there a program I could use to make the process simpler (some sort of Bittorrent or DC++ program)?
Or is there a good online service that is free that allows large amounts of storage?
Thanks for the suggestions.
-Josh

You could...
...turn on port forwarding in the destination router, forwarding port 22 for ssh to the destination computer
...turn on remote login on the destination computer
...turn on file sharing on the destination computer
...open a Terminal window and type ssh -L5548:localhost:548 [email protected] 
where "user" is a valid account name on the destination computer and "IP.of.dest.Computer" is the IP address assigned by the destination computer's ISP to its broadband modem. The destination computer can get this information from http://www.whatismyipaddress.com/ as BDAqua said. Then, so long as the ISP doesn't change the dynamic IP address before you actually do the transfer, you're okay. It's possible to get a free dynamic host name which circumvents this problem.
After all that, then on the source computer, you would just do a ⌘k and enter localhost:5548 and select the shared user account and login, then the remote computer will mount like an icon on the desktop of the source computer, as if it werre a local external drive. Then it's just drag-and-drop. ⌘e when done, then in terminal, type exit and then ⌘q.
I would not leave port 22 forwarded in the router any longer than I had to, unless you do a little work to harden your ssh remote login. However, even if you do nothing to harden it, it is way better as is than leaving ftp open.

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