The ResourceShelf

Gary Price's weblog with search engines news, research-oriented resources, and an opt-in weekly newsletter.
http://www.resourceshelf.com/

Free Pint

Newsletter with tips on using the internet for serious research, posted twice a month.
http://www.freepint.com/

ResearchBuzz

Tara Calishain reports on the world of internet research. Provides updates on search engines, data managing software, browser technology, large compendiums of information, and web directories. Free and for-fee email newsletters available.
http://www.researchbuzz.com/

Internet Resources Newsletter

A roundup from Heriot-Watt University Library of new resources for academic users.
http://www.hw.ac.uk/libWWW/irn/irn.html

The Internet Tourbus

Free email newsletter by Bob Rankin and Patrick Crispen published twice a week, covering search engines, spam, viruses, cookies, urban legends and useful websites.
http://www.tourbus.com/