What are these guys looking for as an investment? David Lee and Pietro Dova are ex-Googlers who were fortunate to be at the search giant in the "early" days, when Google was worth well below its current market value of $140 billion. Today, they're part of a growing number of millionaires and full-time angels seeking to parlay their riches and expertise by investing in and advising startups. So far, so good. Their biggest hit to-date is Tapulous, one of the leading iPhone apps. Other well-known Google angels, which make up the Google Mafia, include Georges Harik and FriendFeed co-founder Paul Buchheit - both of whom are investors in Vator. David and Pietro are partners at XG Ventures, an angel outfit focused on Internet and mobile startups. Together with two ... [ Read more ]