Formative and Summative Assessment in the Classroom
http://www.nmsa.org/Publications/WebExclusive/Assessment/tabid/1120/Default.aspx

Background, philosophy, ideas

Article defining formative assessment -- some examples as well

Assessment information

National Middle School Association (NMSA); Web publication by Catherine Garrison and Michael Ehringhaus.

Good explaination of both types

Arizona K-12 Center Website for Teacher Professional Development

Technology ideas

Lots of good tech info