Renewable energy in general, the advances in photovoltaic technology specifically.
Nanotechnology. Nanotechnology is also driving a great deal of the advances in the above said fields - especially photovoltaic.
Concurrent software will be the next big boom for information technology - cloud computing will ride off of it and we will begin to see concurrency designed web-applications. The Semantic Web, Service Oriented Architecture, and Ontology Oriented Architecture will play a big role in this - if developers can get educated.
Law practices are doing very well. I know water law is becoming big this day and age, my father is a water law/construction defect litigation attorney and does very well for himself.
The new space race is on - this time it isn't between countries but companies; that band wagon will be a good one to be on.
Again, sustainable technology is going to be a big one - people and corporations are beginning to realize the long term savings of sustainable technology far outweighs the initial investment and short term mainstream technologies. Even the initial investment is becoming negligible. (this thought disregards the green effect and is purely from an economic standpoint)
Just a few ideas of the key areas I think we will see quite a bit of growth - I'm a technologist if you haven't noticed, so, what I've written will be geared for that.
You may be interested in marketing yourself as a for-hire CEO for maturing tech startups in the above fields. Founders often want to start a company and maintain majority control; but, do not want to run the business side of things. That may be a good in-road for you.
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