Good general articles in the business and general media:

Want a sharp mind for your golden years? Start now

You’re Wiser Now

Change or Die

On how new neurons are born and grow in the adult brain:

Salk Scientists Demonstrate For The First Time That Newly Born Brain Cells Are Functional In The Adult Brain

Old Brains, New Tricks

On the surprising plasticity and development potential throughout life:

Brain Plasticity, Language Processing and Reading

Juggling Juggles the Brain

Successful Aging of the Healthy Brain

On Training the Brain to help people with ADD/ADHD:

Training the Brain: Cognitive therapy as an alternative to ADHD drugs

On the importance and impact of mental stimulation and training:

Brain Work-outs

Training Improves Cognitive Abilities of Older Adults

On the role of mental stimulation in protecting the brain:

Mental stimulation staves off dementia

Mind-Building Hobbies Prevent Alzheimer's

On the importance of building a Brain Reserve:

Level of Job Difficulty Linked to Alzheimer's

Other important aspects:

Stress and the Brain

Exercise and the Brain

Humor, Laughter and The Brain

Selected Scientific Abstracts:

Ball K, Berch DB, Helmers KF, et al. Effects of cognitive training interventions with older adults: a randomized controlled trial. JAMA. 2002;288:2271-81.

Klingberg T, Fernell E, Olesen PJ, et al. Computerized training of working memory in children with ADHD--a randomized, controlled trial. J Am Acad Child Adolesc Psychiatry. 2005;44:177-86.

Mahncke HW, Connor BB, Appelman J, et al. Memory enhancement in healthy older adults using a brain plasticity-based training program: a randomized, controlled study. Proc Natl Acad Sci USA. 2006;103:12523-8.

Scarmeas N, Stern Y. Cognitive reserve and lifestyle. J Clin Exp Neuropsychol. 2003;25:625-33.

Tarraga L, Boada M, Modinos G, et al. A randomised pilot study to assess the efficacy of an interactive, multimedia tool of cognitive stimulation in Alzheimer's disease. J Neurol Neurosurg Psychiatry. 2006;77:1116-21.

Willis SL, Tennstedt SL, Marsiske M, et al. Long-term effects of cognitive training on everyday functional outcomes in older adults. JAMA. 2006;296:2805-14.