Between Zeus and the Salmon: Online version of multi-author book describing biology and demography of longevity. Book can be ordered from National Academy Press.
Calculation of Life Expectancy: Concise explanation of the mathematics of life expectancy calculation with links to related concepts.
Genetics of Longevity: Powerpoint presentation by Tom Kirkwood, who developed an evolutionary theory of longevity which he calls "disposable soma".
Healthy Life Expectancy: Offers an international comparison of disability adjusted life expectancies.
Innovita Research Institute: Research on aging, molecular concepts of aging, cloning and age-related diseases such as Alzheimers, Werner syndrome, and Parkinsons.
Review of The Quest for Immortality: Science at the Frontiers of Aging: Generally favorable review of a book by Olshansky and Carnes that argues that large increases in life expectancy are unlikely in near future wihout fundamental advances in the science of aging. (Requires registration, but is reprinted in entirety on Amazon.)
Roman Life Expectancy: Roman Life Expectancy: calculations and caveats about accuracy.
senescence.info: Informational website on Gerontology and Aging Research