Integers and Signed Numbers Worksheet
Use this site for information on integers, absolute values, comparing integers, and for adding and subtracting integers. This site allows you to create your own worksheets for these topics.
http://www.edhelper.com/integers.htm

Multiplying and Dividing Integers
This site gives some practice multiplying and dividing integers.
http://www.math.com/school/subject1/lessons/S1U1L12DP.html

Review of all Operations with Integers
This interactive site is an excellent site for practicing and comparing all integer operations.
http://wms.watertown.k12.ma.us/math/math_help/gradeseven/accentuatethenegative/Integers.html