A lot of people don't realise it but a lot of the tasks you do for you employer could very well have been a startup. There's a reason your employer has you working on those problems: They know what their clients want.
Cisco is famous for funding startups by its fromer employees that satisfy their client wants. Google might be trying something similar with Area120?
Being successful at startups is although an entirely different matter, and I guess that's why most people don't take up the opportunity. The paychecks are golden handcuffs, for some.
I think, these pg essays are relevant:
http://paulgraham.com/before.html
> The component of entrepreneurship that really matters is domain expertise. The way to become Larry Page was to become an expert on search. And the way to become an expert on search was to be driven by genuine curiosity, not some ulterior motive.
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> At its best, starting a startup is merely an ulterior motive for curiosity.
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http://paulgraham.com/start.html
> ...you don't need a brilliant idea to start a startup around. The way a startup makes money is to offer people better technology than they have now. But what people have now is often so bad that it doesn't take brilliance to do better.
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> The best odds are in niche markets. Since startups make money by offering people something better than they had before, the best opportunities are where things suck most. And it would be hard to find a place where things suck more than in corporate IT departments. You would not believe the amount of money companies spend on software, and the crap they get in return. This imbalance equals opportunity.
> If you want ideas for startups, one of the most valuable things you could do is find a middle-sized non-technology company and spend a couple weeks just watching what they do with computers. Most good hackers have no more idea of the horrors perpetrated in these places than rich Americans do of what goes on in Brazilian slums.
> Start by writing software for smaller companies, because it's easier to sell to them. It's worth so much to sell stuff to big companies that the people selling them the crap they currently use spend a lot of time and money to do it. And while you can outhack Oracle with one frontal lobe tied behind your back, you can't outsell an Oracle salesman. So if you want to win through better technology, aim at smaller customers.