For up to date race info / placings, they should adopt the icard / Gameboy system used at ALMS races and others in the US.
Given the sheer size of the circuit, I'm
guessing it would be a considerable expense to outfit La Sarthe with all the necessary transmitters/repeaters, etc. Consider that most North American road courses are under 3 miles in length and/or fold in on themselves, I think they're all covered by one transmitter. Of course, I also wish they'd adopt it since I finally bought an iCard this year. Maybe by 2010...
Champ Car has live timing available by mobile WAP. Even that would be a nice supplement to RLM, especially if you're somewhere that hearing isn't an option. It seems that would be relatively easy considering that the Euro mobile systems are light years ahead of the U.S.