Thanks! Well I live in the New York area, so I don't know if it was promoted differently here. I just saw a commercial one night (Saturday), wrote down the number and tried! Apparently, there was 10 days of qualifying phone calls.
From what I gathered, though, is that Millionaire has auditions in different parts of the country as well as applying by submitting a videotape. I would check the website on how to get on the show.
My group was two shows of ten people each. Contestants chosen were pretty equal amongst the three different ways of qualifying. I was told that the phone qualifiers were chosen completely randomly from the pool of those who answered 5 questions via phone, so I feel really lucky I was chosen at all!