It seems odd to me that the announcers don't make more use of raw data. When I want to figure out how fast the peleton is going, I have to use a stopwatch and wait for them to pass two mileposts (or whatever you call mileposts in metric). The math isn't all that complicated, but I shouldn't have to do it.
As a casual fan, more speed data would be very interesting to me -- especially during climbs. I know that a good 10% grade can slow me down to a crawl. They look like they are flying.
An example of something that would be interesting -- make note of the breakaway's speed at a particular point, then inform the listeners of the main peloton's speed at that same point. Talk about where the peleton is making up ground, and where it is losing ground.
I have heard them mention wattage data, but it comes up less than once an hour. WHY???? It would seem to me that they'd mention it every time the terrain changes, attacks are launched, etc. etc. etc. Yesterday, when the field was waiting for the crash victims to rejoin the peleton, they looked like they were barely pedaling. What kind of wattage were they putting out? Probably more than I can on an all-out sprint.... but I don't know because they didn't freakin' tell me.
Full disclosure -- I've only watched about 30-40% of the coverage so far this year, including all of yesterday (Sunday).