It's Beginning to Look a Lot Like...

Kwanzaa! Hanukkah! Christmas! Saturnalia!
















The St. Nicholas Center: Discovering the Truth About Santa Claus
Epicurious Holidays: Hanukkah
How We Celebrate Hanukkah
The Official Kwanzaa Web Site
Solstice, Sacaea-Saturnalia, Yule
La Virgen de Guadelupe
The Christmas Story from the Metropolitan Museum of Art
Season's Greetings from Werner Drews from the Smithsonian Institution

From the Better to Give Dept.
Holiday Giving Guide (Jane already posted this in Comments, but it is worth mentioning twice)
Marine Toys for Tots
The Best Gifts Don't Always Cost the Most from NPR

UPDATE: Want to avoid a certain holiday party? Visit this handy Holiday Party Excuse Generator for inspiration! The Department of Education and First Book make a 200,000 book donation to Gulf Coast libraries and schools. Track Santa with NORAD and Google Earth, from Search Engine Land.