Almanacs

Her Majesty's Nautical Almanac Office - Produces the Astronomical Almanac, the Nautical Almanac, Astronomical Phenomena, the Star Almanac and the UK Air Almanac.
http://www.nao.rl.ac.uk/

Computer Almanac - Collection of numbers relevant to computers, along with references
http://www.cs.cmu.edu/afs/cs.cmu.edu/user/bam/www/numbers.html

Community Almanac - Online version of America-wide almanac for small urban communities.
http://www.thealmanac.net

CNN Daily Almanac - Provides daily briefs of historical events, previews of currently developing stories, and links to related sites.
http://www.cnn.com/almanac/daily/

J. Grubers Hagerstown Town and Country Farmers Almanack - Weather predictions, garden, health and home, who's who and astronomy.
http://www.almanack.com/

University of Pennsylvania Almanac - Compilation of information on politics, social studies and history.
http://www.upenn.edu/almanac/

Almanac Online - Companion to National Public Broadcasting's award-winning radio and television programs: art, music, history, and current events.
http://www.ktca.org/almanac/index.shtml

The Almanac News - A source for local news for citizens of Palo Alto and Mountain View communities.
http://www.almanacnews.com

The Moron's Almanac - Humorous take on almanacs. Compares two unrelated events on their anniversary.
http://www.justmorons.com/

Computer Industry Almanac - An annual reference guide to the computer industry. Thousands of links.
http://www.c-i-a.com/

The World Almanac - Features online ordering of the print edition, today in history, and today's birthdays.
http://www.worldalmanac.com/