For undergraduates: AIP's Society of Physics Students Careers Toolbox
AAS member Robin Corbet has provided the AAS with a result from his 2004 survey of academic astronomy and physics programs in the US. It shows the number of assistant, associate, and full professors as a function of years from PhD.
Tomorrow's Professor Listserv Site – The listserv sends emails a few times a week with information about teaching, research, tenure, and other topics of academic interest.
SabbaticalHomes.com – A website dedicated to helping academic communities around the world find or list houses for rent, exchange, or house-sit when on sabbatical leave.