Aunty Math
The DuPage Children's Museum in Wheaton, Illinois, has created an engaging math Web site featuring Aunt Mathilda (Aunty Math) and her nieces and nephews. Children solve challenging word problems which may be adapted for young children. Extensive teacher tips are available.
http://www.dupagechildrensmuseum.org/aunty/index.html

Kindergarten Math Lessons
Review counting skills and more on this interactive math Web site. Topics include Numbers and Counting through Ten or Twenty, Counting Down, Patterns, More and Fewer, and Adding and Subtracting using objects, numbers, and words.
http://www.aaamath.com/kindergarten.html

Math League Multimedia: Metric Units and Measurement
Learn the fundamentals of measurement.
http://www.mathleague.com/help/metric/metric.htm

abcteach
This site is filled with links to dozens of fun printable puzzles for children to solve, including mazes, dot-to-dot puzzles, math word puzzles, crosswords, word searches, and more.
http://abcteach.com