1. Looks like Personal Development will be my greatest hobby in the following years. I'm reading tons of materials in this topic and I'm enjoying it currently more than anything else.

a) Here is this professor who (by his name) comes from my country, called Mihaly Csikszentmihalyi. He wrote some books that I definitely wish to read in the following months.
Flow: The Psychology of Optimal Experience
The Evolving Self
Creativity : Flow and the Psychology of Discovery and Invention
Finding Flow: The Psychology of Engagement With Everyday Life
Good Business : Leadership, Flow, and the Making of Meaning
Beyond Boredom and Anxiety: Experiencing Flow in Work and Play
The Art of Seeing: An Interpretation of the Aesthetic Encounter
The Meaning of Things : Domestic Symbols and the Self
Talented Teenagers : The Roots of Success and Failure (Cambridge Studies in Social & Emotional Development) (Am I still considered to fall into this category? I think no. But it will probably open up my eyes in many areas; at least I'll know what to teach to my child when the time comes)
Optimal Experience : Psychological Studies of Flow in Consciousness

b) Then comes David Allen:
Getting Things Done
Ready for Anything: 52 Productivity Principles for Work and Life or the translation of it (probably the first because I prefer original content)

c) The Power of Now by Eckhart Tolle

d) Books by Kiyosaki

e) Hackers and Painters by Paul Graham (I share his views).

2. Tech Books which don't fall either into the personal development nor the business category but the web development/architecture field which I love too.

a) I'd like to read Jason's one called php|architect's Guide to Design Patterns

b) Some more PHP/Web/Architecture-related books:
Patterns of Enterprise Application Architecture by Martin Fowler
Refactoring: Improving the Design of Existing Code by Martin Fowler
Refactoring to Patterns by Joshua Kerievsky
Enterprise Integration Patterns : Designing, Building, and Deploying Messaging Solutions by Gregor Hohpe
Extending and Embedding PHP by George Schlossnagle
Scalable Internet Architecture by Theo Schlossnagle