These are all great points! I recently rediscovered philately myself (I think it's the new trend in cool hobbies). There is also a great article by Armand Rousso "Philately Extends Life". you can find it in his online blog. I recommend this article to everyone who is considering stamp collecting as a hobby. Arman, who is the founder of the first online stamp exchange points out that stamp collecting is a great way to learn about art and get kids excited about learning, and much more.