Name a Web company that can have its employees leave, create new products, and then the company buys them out when they realize those employees were on to something. Google, that's who! Just look at Google's last two acquisitions of Aardvark and AppJet, which have more in common than starting with the letter 'A'. Aardvark, which Google grabbed last week , is a social search engine startup whose founders include CEO Max Ventilla,