CNet’s Lynn La sits down with Steve Matteson, the typeface designer for Droid and Windows Phone.
Droid Serif and Droid Sans aren’t shabby and he is responsible for Curlz (Curlz?!), but I did like this bit of where he starts with a typeface:

When Matteson begins designing a new typeface, he starts with the lower case g. He likes the way it curves and its proportions. Sometimes, though, he begins with the vowels. They’re in every word, and so the look of the rest of the letters heavily depends on the a, e, i, o, and u.