My experiences somewhat mirror the others - too many of the regular photography magazines are geared toward beginners so many articles are quite light on actual content. You get some good ideas presented but few are willing to go into the meat of any discussion. Thus as intermediate and higher level photographers chances are there is a lot less content in them - esp after a year when the recycling of repeat articles begins.
The other downside is the adverts - I know they have to make their money but when half or more of the pages are just advertisements it really gets to be a bit too much - if you want that many ads just get Adtrader and similar papers.
I would suggest National Geographic as a good option for well written articles and some outstanding photography. The photoshop magazines also seem to come with a bit more content to them; although you will need the latest CS version to make full use of them (always annoys me when I read beginner articles in beginner magazines for photography and they expect the rank amateur to have bought the several £/$100 CS 5 to use the article

)