Her Majesty's Nautical Almanac Office - http://www.nao.rl.ac.uk/ Produces the Astronomical Almanac, the Nautical Almanac, Astronomical Phenomena, the Star Almanac and the UK Air Almanac.
CNN Daily Almanac - http://www.cnn.com/almanac/daily/ Provides daily briefs of historical events, previews of currently developing stories, and links to related sites.
Computer Industry Almanac - http://www.c-i-a.com/ An annual reference guide to the computer industry. Thousands of links.
Gary Price Fast Facts - http://www.freepint.com/gary/handbook.htm Compilation of quick reference resources, including almanacs, statistics, and fact books.
The World Almanac - http://www.worldalmanac.com/ Features online ordering of the print edition, today in history, and today's birthdays.
The Moron's Almanac - http://www.justmorons.com/ Humorous take on almanacs. Compares two unrelated events on their anniversary.
The Almanac News - http://www.almanacnews.com A source for local news for citizens of Palo Alto and Mountain View communities.
Community Almanac - http://www.thealmanac.net Online version of America-wide almanac for small urban communities.
Almanac Online - http://www.ktca.org/almanac/index.shtml Companion to National Public Broadcasting's award-winning radio and television programs: art, music, history, and current events.
Computer Almanac - http://www.cs.cmu.edu/afs/cs.cmu.edu/user/bam/www/numbers.html Collection of numbers relevant to computers, along with references