Fun for rugrats (pre-literate children)

These are some sites that I let my kids use.  Please feel free to send me suggestions to add to this list.  I will not list sites with too much advertising; sites with no advertising are preferred.  Some of the games may need help from a literate partner, but I have been surprised by how self-sufficient my own pre-literate children are on these sites.

Big Idea Fun
Awesome site, fun for kids and adults.  Make sure you try their Tetris variant.

Orisinal
Some of the most original and sweetest games I have ever seen.  Along with a few destructive games that could have been done anywhere.

PBS Kids
Some fun games based upon the kids shows on PBS.

KidsPysch
Educational games aimed at children ages 1 to 5.

Seussville Games
Dr. Seuss games - both online and activities for printing.

Babloo
For children of all ages.

Up To Ten
Fun site with activities for toddlers to those up to ten years of age.

Pauly's Playhouse

Noggin
Semi-educational games based on their TV shows.  Safe place for kids, but only for high-bandwidth users.

MeddyBemps Fun & Games
Fun sites for children with their parents, includes some educational games.

Fun for young literate children

As the heading implies, reading is required for these sites. 

KidsPysch
Educational games aimed at children ages 6 to 9.

King's Call
An interactive web adventure game.

NIEHS
Enjoy the fruits of your taxes at the National Institute of Environmental Health Sciences children's site.

Play Creator
One of the fun options at Kid's Space.

Larry-Boy Game
Larry-Boy fans will love the rest of the site too.

Wacky Warehouse
British site for kids