For a very complete compilation of accidents in the Canadian mountains have a look at
http://alpineclub-edm.org/accidents/index.asp
These reports contain everything from ice climbers swept off 13000 ft Mt. Robson (highest in the Canadian Rockies) to a tourist who climbed over a safety railing, slipped into the Athabasca River, and was carried over the 24 meter waterfall.
Reports are indexed by location, year (1895-2005), type (526 reports under hiking, out of a total of 1494), and cause.
For accident reports in the USA, you can check the news releases for the various Parks. For example, for Yosemite NP,
http://www.nps.gov/yose/news/
there are archives going back to 1997. Here's an excerpt from 8/24/05.
"Shane Kinsella, 21, from Dublin, Ireland, fell over the top of Upper Yosemite Fall on Monday afternoon, August 23, 2005. He was posing for a photograph near the lip of the waterfall when he slipped, was unable to recover, and fell over the 1430 foot waterfall. Kinsella's body was recovered by Yosemite National Park rangers and rescue personnel in a pool at the bottom of Upper Yosemite Fall on Tuesday morning.
This is the fifth accidental death in Yosemite National Park this year."
Vernal Fall averages about 1 per year; this year's is in the 8/1/05 news release.
The US Park Service has an incident site at
http://www.nps.gov/morningreport
but their (publicly available) archive goes back only about a week, so check the morningreport daily.
