I read about this on Leslie's blog, Flowers of Life. She blogs about an organisation called Chemo Angels.
I recommend you visit this site. What a wonderful idea.
When I had chemo and radiotherapy last year ( urggh!) a good friend of mine ( hello wonderful Sheila) sent me cards ( sometimes every day) and gifts ( lots of them- they were all lovely). It made such a difference and really cheered me up.
I also received cards and gifts from many people, both good friends and those more distant. They made a major impact on me and gave me massive encouragement. I will never throw them out ( and I am not usually a hoarder of cards etc).