I had a sub of the entire set, if I haven't lost one, then there are a total of 7 issues (Volume 1 Number 1 - 5, Volume 2 Number 1-2). I seem to have lost two of the companion disks.
The magazine is totally geared towards developers, includes tips and tricks on programming as well as articles about the OS. It's 99% good information and 1% fluff.