Graphing & Tables

Dave's Math Tables
http://www.sisweb.com/math/tables.htm

How to Make a Graph
http://www.rialto.k12.ca.us/frisbie/coyote/math/graph.html

"M&M's" Line Plots and Graphing (K4-7)
http://www.kings.k12.ca.us/math/lessons/mms.htm

Create-A-Venn - Create your own Venn Diagram here. Venns help you describe and compare the elements and characteristics of items.

Spreadsheets

Using Computers to Produce Spreadsheets and Bar Graphs (K4-12)
http://www.kings.k12.ca.us/math/lessons/spread.bar.html 

MathsNet Spreadsheets
http://www.anglia.co.uk/education/mathsnet/ssheets.html

The A-Z of Spreadsheets
http://www.anglia.co.uk/education/mathsnet/a2zofssheets.html