MATH

A calculus wiki for those wicked-long problems so the class can collaborate on how to solve them (a “wicked wiki”?)
A geometry wiki for students to share and rewrite proofs (a geometwiki?). What a great way to see the different approaches to the same problem!
Applied math wiki: students write about and illustrate places where they actually used math to solve a problem.
Procedures wiki: groups explain the steps to a mathematical procedure, such as factoring a polynomial or converting a decimal to a fraction.
Pure numbers wiki: student illustrate numbers in as many ways possible: as graphics to count, as mathematical expressions, etc. Elementary students can show graphic illustrations of multiplication facts, for example.
historical, or cultural locations and time periods: Dickens’ LondItaly in Verona and Mantua ( Romeo and Juliet), The Oklahoma Territory, atriot Paris in the Twenti (Copyright © 2006 Network for Instructional TV, Inc)
Theorem wiki - works especially well in geometry - have students describe and/or define the many theorems, postulates and definitions that they need to know for geometry.