I have given them to the quilt guild, freecycled them, PIF'd them. It gets easier to do once you start doing it. At first I didn't want to part with a single one of them, but then realized, they wouldn't be worth anything, if I could never find what I needed.
I have about 40 archived magazines...and try not to collect any more than that. Everytime my mom gives me a few, I get rid of a few. I quick subscribing 2years ago because it didn't seem like there was anything new being printed.