I get at last count about 40-50 magazines a month. Some of them I have little to no interest in [Sporting News], I'll take those to work and drop them in the break room [we have ~300 people in my building, someone's got to want to read it].
I keep some mags--PSM, Playboy, FHM/Maxim/Stuff, The Week, Newsweek, some of the parenting magazines, all those I keep. Rarely of course do I reread them, but I have gone back and read old PSM's for info on games that were new then, that I just got or got interested in.
The rest I'll either give to my inlaws, if it's a topic they're interested in [Wine Enthusiast], take to the breakroom at work [Barron's, Sporting News, YM, Ladies Home Journal, Smart Money], or just chuck in the recycle bin, sometimes without reading [Potentials, New York Observer].
I went through a couple of boxes of old Sega Visions and misc mags before we moved; I debated putting them on Ebay, but it didn't seem to be worth the hassle.
They do take up a lot of room, and very rarely do I reread many of them--but I want to be able to, if I should suddenly decide to.
How do you store your magazines?
Here's what I get, off the top of my head:
Playboy, Stuff, Maxim, PSM, EGM, Gamepro, Xbox Nation, Reader's Digest, The Week, Newsweek, Ladies Home Journal, Seventeen, YM, Child, Parent, American Baby, Wine Enthusiast, Cruise Travel, Charisma, Sporting News, Psychology Today, TV Guide, Potentials, Budget Living, Family Fun, Forbes, Smart Money, New York Observer, Nascar Thunder, Redbook, PC Photo, and probably about 8-10 others I can't think of right now.