I'm going to get these couple of links over to the Collecting Old Magazines home page when I get to its redesign, but as for now figure I'd post them here. Here are a couple of recent chats I had centered on magazine collecting:
And more recently:
Vintage Magazine Collector Cliff Aliperti on the ephemera blog
There should be some helpful nuggets in each of those for the collector (hopefully not too much repetition as they were conducted 6-8 months apart). Enjoy!