I disagree with the above posts...
I myself bought a few titles for my first two months when I was getting into photography and buying my first DSLR, and they were immensely helpful.
My first lessons on Aperture/ISO/SS etc came from those magazines, as well as basic tips on portraits, landscapes etc...
Of course if you already know a good deal about photography, they will sound very repetitive and useless, but for some one coming from P&S, they were very helpful...for 3-4 months that is....

....then even for me, they started getting repetitive...
What I did in the first month was buy 4-5 titles, and then stuck with one or two titles that I liked ever since.
I recommend Practical Photography(monthly), and Amateur Photography(weekly)....
Howe ever, to be perfectly honest, these days I just flick through them at WH SMITH...
British Journal of Photography from what I hear is superb, but for pros I suppose...