Unfortunately discontinued, but still available in some places. kidBoard, by Little Tykes.

We have them on the game computers in the preschool area at the library. It's a standard keyboard, though, with keys that adult hands can use comfortably.

The toddlers get at them sometimes. I begin to believe they will survive anything short of total immersion or an assault with a hammer. They come bundled with a five-tier alphabet game.

Thanks for the link. For the flashier stuff, try here. A lot of this software comes with teacher packets to do follow-up and enrichment activities. For the little people, I can recommend Reader Rabbit Playtime for Baby and Toddler, Reader Rabbit Toddler Plus, Jumpstart ABCs, Jumpstart Preschool Fun Pack (though this might be a little advanced for a three-year-old by herself), and the Dr. Seuss Living Books. The Dr. Seuss Preschool games get a little involved, but are fun once the child gets the hang of them.

I have no experience with the Clifford, Blue's Clues or Sesame Street software, but I suspect that they are all worthwhile, even though Clifford drives me nuts. Blue's Clues shows special promise, as the show's producers seem to understand preschoolers with alarming precision. ;)

Good luck!

Regards--
Mary Anne