Game Developer magazine has a sample issue online for budding and professional game developers which gives a glimpse on the kind of informative things they have on offer in their monthly magazine.
Part of the April 2005 edition that you can see online include a post mortem on Knights of the Old Republic 2, Everything you need to MMO, Challenges / capabilities of a PSP, and the very interesting Game Developer Salary Survey. If you're a programmer, artist, or audio engineer, or even a game designer, you'll something of interest in here. Be sure to check it out!