How to preserve Li-Ion battery life-time

Following are the links to usefull tips on how to preserve the life-time of the Li-Ion batteries deployed in most of portable devices:
http://laptopmag.com/Features/Five-Tips-For-Better-Notebook-Battery-Life.htm
http://monkeyfilter.com/link.php/7094

Conclusion: Manage full discharge-charge cycle at least once a month to prevent build up of the permanent chemical bondings in battery's materials.