100th day of school:

Vickie Blackwell's 100th day of school: http://www.vickiblackwell.com/100th.html
Enchanted Learning 100th day of school: http://www.enchantedlearning.com/themes/hundred.shtml
Perpetual Preschool: http://www.perpetualpreschool.com/preschool_themes/100th/100thday.htm
Interactive Number Chart: http://www.apples4theteacher.com/math/games/100-number-chart-zero.html
Apples 4 the teacher: http://www.apples4theteacher.com/holidays/100th-day-of-school/
Math Wire: http://mathwire.com/seasonal/100day.html
Teaching Heart: http://www.teachingheart.net/hundreddays.html
Scholastic: http://teacher.scholastic.com/lessonrepro/k_2theme/100days.htm
Global Classroom: http://www.globalclassroom.org/100days.html
Mrs. Alphabet: http://www.mrsalphabet.com/100thdaylinks.html
Teachers' First: http://www.teachersfirst.com/content/spectopics/100thday.cfm
Friday 5: http://groups.google.com/group/friday5/browse_thread/thread/c541cab670e2c68d
Teacher Mouse Pad: http://www.teachersmousepad.com/100thday/100th%20Day%20of%20School-active.htm
Teach the Children Well: http://www.teachthechildrenwell.com/other.html#100
Kennesaw Edu: http://webtech.kennesaw.edu/jcheek3/100thday.htm
Siec: http://www.siec.k12.in.us/~west/proj/100th/
100 Picture books everyone should know: http://kids.nypl.org/reading/recommended2.cfm?ListID=61

Interactive:
Game Quarium: http://www.gamequarium.com/100thday.html
Apple 4 the Teacher: http://www.apples4theteacher.com/holidays/100th-day-of-school/
Apple 4 the Teacher: count by 10's: http://www.apples4theteacher.com/holidays/100th-day-of-school/counting-by-tens/
Apple 4 the Teacher: interactive 100 number chart: http://www.apples4theteacher.com/math/games/100-number-chart-one.html
Teacher Mouse Pad: http://www.teachersmousepad.com/100thday/100th%20Day%20of%20School-active.htm
Online Math Games: http://www.amug.org/~jbpratt/education/math/onlineact.html