iTunes

Use iTunes for management development -

Mind Maps

Tony Buzan created mind maps as the ideal tool for memorising and organising thoughts, to do lists, etc.

Here's Tony explaining the basics of mind-mapping -

Mind Tools

The mind tools website is a nice resource for articles regarding leadership, time management, problem solving, decision making, memory tips, using creativity, stress management, information skills, etc.

Some example articles:

How good are your motivation skills?
Weighing the pros and cons of a decision.
DO IT - A simple creativity process
The Golden Rules of Goal Setting
Mind Maps
Active Listening
Using Mind Maps as a memory tool