I came across this great article on compression garments. Check out my blog post on this which gives you a link to the article Do compression garments runners and other athletes wear make a difference in health or performance? http://bit.ly/UBTXNS
Actually, the problems both pb junkie and barefoot dama described have to do with problems in the kinetic chain, tight calves and core instability. Some of the compression wear use the concept of proprioceptive taping to improve the firing patterns while you run or walk, perhaps this is why you feel improved rather than the compression alone.