This is a good site for high school math webquests There are many different levels from algebra 1 through calculus so these examples could be used and changed to bring down to middle school level and great for using in advanced middle school math classes
This is a great site that talks about the three learning domains of students: cognitive (knowledge), affective (attitude) and phychomotor (skills). I learned a lot reading this and found it insightful.
This site explains the need for certain revisions to Bloom's Taxonomy because fifty + years have passed since its original inception and teaching methods, learning styles and such ave changed drastically in that time. This site discusses a revision of the taxonomy which combines the cognitive and knowledge domains into systems which help teachers individualize instruction and best serve the needs and learning styles of students.