Not What They Appear to Be:

Felines & Bearded Men

More from Improbable.com

MartinLutherKing.org

Whitehouse.org

BonsaiKitten.com

GunsforKids.com

MalePregnancy.com

Manbeef.com

Hinduism.org

TouristofDeath.com

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Check who owns a site:

NetSol.com whois
BetterWhois.com

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Check who's linking to a site:

LinkPopularity.com

Further Reading:
Poynter Tip on Tracking Hoaxes
My column on how to avoid being fooled by hoaxes

Jon Dube's tips on avoiding being fooled:
http://www.poynter.org/web/040502Jon.htm
http://www.poynter.org/web/032802Jon.htm

AJR on journalists and Web information
Article by Carl Cannon, White House correspondent for National Journal

My Forwarding Experience
A warning on forwarding e-mail

Report on the Emulex scam that fooled journalists
Simon Hatcher report
USA Today report

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Check the Sourcing:

Patsy Cline music deemed dangerous to women
Even though it was helpfully labeled "satire," a major newspaper columnist ran a story citing this.

Vicente Fox's MBA
Note how mistakes are repeated in old media

The famous Chinese movie title fiasco
See an e-mail joke list joke become fact in The New York Times and elsewhere

The Sunscreen Song
Read a NYT story about Kurt Vonnegut speech that wasn't

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Sites That Deal with Hoaxes

Urbanlegends.about.com

Snopes.com

Vmyths.com

Hoaxkill.com

NMSU's Susan Beck & the Web info evaluation guide

Vitrual Chase's checklist for evaluating information