My wife found this design magazine with an issue 50% devoted to postage stamps and the whole element of their design. It is pretty artsy stuff, but it presents stamps and what they represent in a unique way. I haven't read the mag yet, but I am excited to see how modern day designers look at stamps and their design. The cover of fancy cancelled early US stamps is nice to look at as well. I figure any young/hip coverage for the hobby is good.
http://uppercasemagazine.com/issue26