1. Interactica: astounding, massive, mind-expanding, beautiful
2. Starfall: beautifully done- learn the alphabet, then learn to read.
3. Bembo's Zoo: cute animated alphabet.
4. Phun : not a website- you'll need to download it- 2-D "physics engine".. hours of phun.
5. Flowers : great little app from zefrank- let your kids scream at the computer and watch the 'flowers' grow. Mine were shouting "PINEAPPLE! PINEAPPLE! PINEAPPLE! PINEAPPLE! ". The neighbours think we are strange.
6. Frog: you talk- the frog talks! As close as you can get to playing with a puppet on a computer. Kids find this hysterically funny.
If you have any others- please leave a comment.