In the past, I have used dynamic IP services such as No-Ip.com and DynDNS.org to provide my home with a stable identifier on the internet. My router, a Linksys WRT-310N (running DD-WRT) is supposed to support running a daemon to update your IP at providers such as these, however I found that the scheduler ceased to call the update script after about a day. As a result, my IP address was usually out of date, or my referral domains were disabled due to inactivity, etc.

I recently had a brain fart that has resulted in a rather convenient scheme: Gmail! Add the bottom of your inbox you may find a line that reads like

This account is open in 1 other location (123.456.789.012).

As long as you leave your home computer logged into Gmail, then wherever you are, if you need emergency access to your home IP address, you can just look it up in Gmail.