Some examples of raised cross walks.
Top photo courtesy of http://www.millermicro.com/crt-design.html#OCP
Bottom photo courtesy of http://streetswiki.wikispaces.com/Raised+Crosswalk
An example of a raised cross walk with a protective pedestrian refuge.
Photo courtesy of http://www.gcpvd.org/2009/06/25/you-spin-me-right-round/
These crossings are great for those of age, since most elders often have mobility issues. By keeping sidewalks at the same grade while crossing you decrease the chance that a senior will slip or trip over the curb. A person in a wheelchair puts less strain on their muscles as it is one less incline they have to pull their body weight up. There is also less of a chance of their wheels getting caught in a gutter. These crosswalks will needed soon especially with the baby boomers entering their senior years.
Another feature that I would love to see are complete intersections being raised as seen below. These have the same benefits as before as far as traffic calming and easier pedestrian crossings. However by raising whole intersections you can make it easier for pedestrians to make diagonal crossings without the change in altitude. Accidents are the most frequent within intersections, so if you reduce the speed that someone can traverse through an intersection you can reduce the number of accidents.
An example of a raised intersection.
Photo a courtesy of http://streetswiki.wikispaces.com/Raised+Intersection