I got this site from the yahoo group of cyber schooling. My kids started in cyber school October and November last year and my youngest son started playing since then. About a week or two into it he already knew the alphabets and sound. He does not play with it much these days. I think he got board pretty fast.
Mind you he was taking speech therapy from March 08 until February of 09. At this time I am very surprise on how he is already caught up with his speech. Sometimes I question myself and taking a second look on who was talking. "Did it really came from my 3 year old son? Try it out, you will be amazed how much your toddler love to learn.
I have the site under my children favorites. Because sometimes I can't get the letter sound out right from my mouth and I just open this, play the letter and problem solve. Being born into a non-English speaker parents, this site is my lifesaver.