Finally, this has been something I’ve been wanting for a long time.
MobileMe News: Your Personal File Server Wherever You Go
Recent updates to Apple’s Airport firmware enable you to use Back to My Mac to remotely access files stored on Time Capsule (or a hard disk attached to AirPort Extreme with 802.11n) from a Mac running OS X Leopard. The device’s disk will appear on your Mac in the Shared section of the Finder sidebar when you’re connected to the internet, and you can treat it as a personal remote file server, dragging files to and from it as needed.
To set up a device, Open AirPort Utility on your Mac, click Manual Setup, then click Advanced in the toolbar and select MobileMe. Enter your MobileMe member name and password and click update. For more detailed instructions download the Back to My Mac User’s Guide
Basically now I can buy a AirPort Extreme, put my MobileMe login information in and have it show up in the sidebar of my Finder window just like it was a computer on the local network. Gone are the days of having to make a record of your IP address before you leave in the morning, using a 3rd party dynamic DNS service or worrying about your provider’s router’s annoying firewall. I can only dream that I could someone have it share a Network HD in the same way, then I can get this 
massive 4Tb drive for all my file storage and access it from anywhere. I guess for my purposes USB 2.0 is fast enough since all the data of the type I’d want to put on the external drive is already on an external USB 2.0 HD, but it would have been nice to utilize my 1000mbit internal network in combination with my 1000mbit Fiber connection.