EyeTV launched Live TV streaming to the iPhone over 3g. It’s a web app that you pull up in the Safari browser. By going to live3g.eyetv.com you are prompted to logon. You can watch your recordings along with live Tv.
It’s not full featured like the iPhone App, which costs $4.99, but it might save you from missing your favorite show if you can’t find wifi. The Elgato website has more info along with a nice comparison chart for the paid iPhone app vs. the web app.