What's the holdup with hydrogen power?

What’s taking the development of hydrogen-based energy technologies so long to come around? I realize that building up the infrastructure to make hydrogen powered cars a common thing may be a while off, but even for more basic applications it seems like it’s taking forever and I’m not sure why. Here’s an example: Time magazine announced this hydrogen-powered backup generator one of the “coolest inventions of 2003.” here’s the link: http://www.time.com/time/2003/inventions/invgenerator.html

After looking around to see how that product has evolved over the past 5 years, you come to find out that it was never put into production. The fuel cells currently on the market are pretty much all for research purposes, and not really designed for implementation in products sold to the public. What’s with the holdup?