MindCert provides a free Certified Ethical Hacker (CEH) mind map

Certified Ethical Hacker - Module 5 - System Hacking Mind Map
Sections include: Remote Password Guessing, Eavesdropping, Denial of Service, Privilege Escalation, Keystroke Loggers, Password Cracking, Covering Tracks, Remote Control, and Covering Tracks

Certified Ethical Hacker - Module 4 - Enumeration Mind Map
This Mind Map covers the main forms of Enumeration such as NetBIOS Enumeration, Null Session Enumeration, SNMP Enumeration as well as Active Directory Enumeration. Sample tools that can be used to Enumerate in each instance are also provided.

Certified Ethical Hacker - Module 3 - Scanning Mind Map
This Mind Map covers module 3 of the CEH curriculum. This is Scanning. This Mind Map and module covers the detection of live systems on a network as well as the detection of services on those systems. This is also known as port scanning, and one of the best port scanning tools is Nmap. Nmap is covered in depth within this Mind Map along with the command line options for performing different scans with it. As well as Nmap, other port scanning tools are reviewed as well as direct links to download them.

Certified Ethical Hacker - Module 2 - Footprinting Mind Map
The second Mind Map from MindCert.com covers Footprinting. Footprinting is the initial reconnaissance that a hacker carries out in order to gleam information about the target of evaluation. The type of information that is obtained through footprinting is normally in the public domain so this is classed as passive reconnaissance as you do not have to do anything active, against the target of evaluation at this point.

Certified Ethical Hacker - Module 1 - Ethical Hacking Mind Map
This Mind Map covers module 1 from the Certified Ethical Hacker exam blueprint. Module 1 is titled Ethical Hacking and it covers the terminology used to represent Ethical Hackers.