I don't know a whole lot about those fields. Check out the AMA vacant residency site:
http://www.ama-assn.org/ama/pub/article/2259.html
You'll see that more than a few Radiology programs are vacant even two months after the Match.
I'm not sure what other information you are looking for. If you want general information on specialties, then you should write to the board granting organization (ie. American Assoc of Pathologists or American College of Pathologists or whatever they're called). They have tons of free literature that they'll send to you.
If you're interested in specific programs, then you should write to each program for literature. They usually have updated literature in the early summer in anticipation of the Fall applications. And yes, those are free too.
Check out this site:
http://www.medmatrix.org/Index.asp
It has lots of information on residency programs.
By the way, of the three specialties you've listed, only anesthesiology has any significant patient contact. Most pathologists and radiologists have offices in the basement of hospitals and rarely see patients. I volunteered with a pathologist and never saw a patient in the 4 months I worked. However, all 3 specialties have very regular hours with few on-call requirements, to my knowledge.
By the way, many med schools post their match list on the school's sites. If they didn't then you can probably call the office of students affairs (rather than the admissions office) and have them fax or mail a copy of the match list to you.