The appetite of venture capitalists for investing in new technologies is rebounding: in 2004, venture capital financing in the United States was up 8 percent from the year before, following three years of decline. With the success of Google's initial public offering (IPO) in August 2004, technology again excited the public imagination. Indeed, the window on IPOs opened wide in 2004, with 233 companies going public on U.S. stock exchanges and raising $43 billion, up from 79 companies and $16 billion in 2003. Biotechnology IPOs were particularly successful, raising $2.5 billion, the most since the $8.7 billion raised in 2000. So why are many of those involved in the funding of emerging technologies so worried?

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