After talking with several parents at the State Convention, I realized that there is something special going on with this last generation of children.  They are ready to learn at an earlier age.  They are asking their parents for more reading, more writing, more learning.  Talking with the parents, I found this was true for boys and girls.
Now, I will continue to advise parents go to at their child's pace, knowing that there will be plateaus when they tire of *schooling*.  The most important thing is to not quelsh the love of learning in any child, not to destroy that wonderful imagination that God gave each of His children.  When they are intested in something, go for it.  If there is an event in your community for young ones, feel free to take the kids even if they have not finished their seatwork.  For the younger child, experiences are learning, and help them with assimiliating information learned from reading.  Well, enough from me, here are the resources:
Crayola has a site for kids and for educators.  Great things to print.
The US Post office has a great site with stamps from every state as you travel across the map.  IF you want just the stamps to color, right click and pick View Image, you will get another window with just that picture which you can then print and color. ~Jube
This Montessori site is mostly a sales site, but if you look under Resources, there are articles and links you might find helpful.
The Joyful Child is a FREE ebook that discusses Montesorri Methods with small children.
If you child love to color, here is a page with lots of PDF pages to print and color.  Paper Hint: if you have old paper that have words printed on one side,  reuse them for coloring pages if they are not too bent up.
Suzie's Coloring Pages, lots of links and pages.
Spanish Pre-K lesson plans and activities.
Pre-K Crafts and Activities. First-School features free fun preschool lesson plans, educational early childhood activities, printable crafts, printable activities, calendar of events and other resources for children of preschool age.
This Library has a list of sites for Preschoolers. Check each site to see if it's right for your family.
Another directory of PreSchool Links.
More later :-)