I really like Endless Alphabet. It has letters, sounds (though not always accurate), and it's a funny, playful cartoon with easy finger interaction.

Not sure about Road Rally. The idea of my toddler holding the iPad up in the air to turn it side to side sends shivers down my spine.

You mean anyone more "enlightened" than those who can't help but notice the "sexy" category at the top of this website?
http://www.elephantjournal.com/tag/sexy/