Really, there is almost no reason to have this information. And outside of iffy resources like FREIDA, there aren't valid databases which compare across all specialties. Even if you got the info from ACGME, considering that programs that exceed hours on a regular basis often lie, its not really helpful if the data is skewed because people are lying to ACGME.
Without getting into a discussion of whether or not you are choosing a specialty based on the hours, as Pilot Doc notes, the hours will vary widely from program to program and within rotations. Looking at a website like FREIDA, which is self-report and notoriously inaccurate, and seeing that a program lists average hours as 60/week is really of no help unless you realize that "average" probably means "least number of hours" and that in some cases you may work many many more. You might work less, but that's unlikely.
The FREIDA database is filled out by some administrative type who often has no connection with the real clinical duties completed by residents. For example, I'm looking at my residency program...in their favor, they list average hours worked per week as 80. Of course, that's generally not true, but we'll give them the benefit of the doubt. But I can see several things that are wrong, like amount of home call, average length of call, etc.
The point is that:
1) these things are inaccurate at best; fraudulent at worst
2) they don't paint the entire picture - hours will vary from program to program and depending on the census, work load, and rotation
3) as Pilot Doc notes, residency is a short period of time in your life. Choosing a program based on hours, when most of them will not vary significantly, seems a bit short-sighted to me.