Reader offer This week's discounted bunch of fives from Reg associate IT-minds bookstore features Understanding Open Source Software Development by Joseph Feller and Brian Fitzgerald.

The book addresses the fundamental questions of "what, why, when, where and how" the Open Source process has been able to produce category-killing software without the support of a traditional software engineering environment. It normally sells at £22.99, but Reg readers can - for this week only - get it at 20 per cent off.

The other titles are:

• Core Perl
• Cisco® Secure PIX® Firewalls
• JavaScript Design
• Inside LightWave 7

Remember, each and every week IT-minds offers readers 10 per cent off a range of IT literature, and another 10 per cent off five featured titles