You can’t get more canonical than the government. Everyone should know about this website, which is the official US time (here it’s set to Pacific).
http://nist.time.gov/timezone.cgi?Pacific/d/-8/java
Another great government website, to find out what’s really going on…:
Another one that comes up from time to time:
(And for the definitive word on whether a movie sucks or not, see my sig. 
)
The Smithsonian Institution
And two good sites from entities within the Smithsonianian:
http://www.siris.si.edu/
The Smithsonian Institution Research Information System (SIRIS). An online card catalog for all of the Smithsonian libraries. Over a million books. You can seach by title, author, subject, or keyword.
http://www.conexus.si.edu/
Site of the Smithsonian’s Indian museum in NYC.
Just thought I’d update this a bit…
Judging from it’s use in GQ, and from the brief little visit I paid it, Quackwatch seems to be the Snopes of the medical community. Handy, that.
And then there’s the canonical website on the Montreal metro:
I should add the canonical site on world metros: http://www.metropla.net
The Canadian government website:
http://www.canada.gc.ca
The CIA world factbook:
http://www.odci.gov/cia/publications/factbook/index.html
How far is it?:
http://www.indo.com/distance/
The International Phonetic Alphabet:
http://www.phon.ox.ac.uk/~jcoleman/ipachart.htm
A very informative website dealing with psychoactive plants, chemicals & the issues surrounding them is The Vaults of Erowid. It’s a great source of information–good for debunking rumors, urban legends & all sorts of misconceptions regarding drugs.
Also–The Crime Library is a great resource for in-depth reporting of many infamous murders, serial killers, etc…
Rutgers University Library’s Electronic Reference Sources, including dictionaries, newspapers, mapping, just about anything. (Unfortunately some of the resources require a rutgers login, but others are free to use.)
f you want to debunk pseudoscience, go no further than the Skeptic’s Dictionary: