National Council of Teachers of Mathematics
The Math Forum: Data Collecting in the Classroom
A list of two dozen questions students can easily ask eachother in the classroom to quickly collect data in hopes of using it in their study of making graphs. Some are opinion questions, while others require the counting of certain items...
University of Georgia
University of Georgia: Inter Math: Types of Data
This site has a concise definition of "Data," plus examples of data types and collection methods.