Sans Institute
The SANS Institute has a good Web site where you can download articles about a wide range of topics – look for the Reading Room link from the front page. There is even a 13 page tutorial on using an Apple Mac laptop running Mac OS X as a forensic analysis station – the Mac can take images of hard drives easily using standard Unix commands in a terminal window.
Many of the papers in the Reading Room were written by students of the Institute on courses so caveats apply. The policy and legal aspects have a US bias but the technical information works world wide.