Right now on Fox Sports Net, you can watch the LIVE broadcast of the final table of the American Poker Championship. It's delayed 5 minutes to lessen the chance of cheating.
I suppose it's still possible for someone to jack into the feed before it goes out live and then transmit that info to a player at the table. It's just very unlikely.
One of the biggest problems with live poker is the potential to be very, very boring. I'll say this, though... so far so good!