I tend to skim-read them in WHSmiths, see if there's anything interesting and occassionally buy one. I used to buy mags regularly, but they just sit around and take up space in my small flat, so I don't often bother with them now.
Have to say though, quite enjoy reading Practical Performance Car mag, often have interesting articles about conversions, upgrades and so on, even though I'm not mechanically minded, I still enjoy reading about project cars.