I found these sites in my travels the other day and thought they may be of some interest to someone who may be doing a short study of Columbus Day.  I decided to omit the ones that argue against Columbus and went with the more basic, traditional views. 

edhelper -unit for grades 4-7

edhelper -unit for grades 2-4

Columbus Day -info with crossword puzzles and word searches

Enchanted Learning -worksheets and activities

Kaboose -some activities and recipes

Teachervision -some free activities and worksheets

About.com -some printables

United States Embassy in Stockholm –interesting read

A to Z Teacher Stuff -lesson plans, activities, and printables

The Holiday Zone -lessons, information, activities and printables

Brownielocks and the 3 Bears– just for fun, interesting read with some humor thrown in

Apples 4 the Teacher -lesson plan ideas, coloring pages, reading lists

I’m sure there are a ton more out there but these should get you started.