ICO Global Communications will be launching its G1 satellite from Cape Canaveral today.

It's not only the largest satellite ever launched by an Atlas rocket, but the ICO G1 is one of the largest commercial satellites ever built and is specifically designed to deliver signals to mobile and portable devices.

If the launch is successful, ICO will be the first mobile satellite services provider to become operational, and the first to deploy DVB-SH (digital video broadcast - satellite-to-handheld) technology in the United States.

There will be a live webcast of the launch starting at 3:40pm ET - the launch window is from 4:12pm - 5:12pm EST - so check it out. If the launch slips, they'll start it up again tomorrow at around the same time.