Computer Music Magazine combines articles, tutorials and reviews with a CD of samples, demos and free tools. There’s a certain amount of fluff in each issue, but there is generally something worth reading in every magazine.
The best articles look at the tecniques used in producting various styles of music. There have also published many good interviews with electronica artists.
One of the coolest things that Computer Music has done is commission a complete Computer Music studio that they give away with the magazine each month. This comes on the CD, and the components are fully-functioning applications, not demos.
The Computer Music studio includes a MIDI/audio sequencer, a very cool drum machine/sampler, a full sample module, a basic TB303 clone, an analog drum simulator module, and effects modules. They are uniformly great sounding, and work in both the supplied sequencer and compatible hosts.