Here is a short list of improvement values that I gathered off the internet last year.  In each case, you can see how many different records I averaged as well as the approximate recoupable percentage of each improvement.  This may be helpful to those selling their home as well as to agents who need to advise their clients as to which improvements may be worth the time.  As NONE of the items are 100% recoupable, a good paint job and clean carpet seem to be the only worthwhile activities.  :)