I think the Boots Health & Beauty magazine is often overlooked, but I really like it; it has useful tips as well as information on new products etc. With an Advantage Card (which I recommend to absolutely everyone, I've colleted quite a few points and gotten several 'free' things with it, plus you can often get exclusive offers- whats not to love?) it's totally free, and there are even some coupons at the back too.
I love Glamour magazine- it seems to be the only womans mag that doesn't attempt to insult my intelligence, or focus on sex and men like so many others! I'm too impressed with the free book though, usually the summer edition has a nice 'holiday read' type of book (last years was I Heart New York, by Lindsey Kelk) but a horoscope book? Never mind, I like reading the magazine anyway.