In general, I settle all my Great People. I am a huge fan of cottage spam, especially with Universal Suffrage, Emancipation, Free Speech, Free Market, and Free Religion. In fact, I take much glee in forcing my civics down everyone's throat via the U.N. There's nothing more satisfying hearing the angry wail of someone who bet the farm on farms.
Still, I enjoy a change of pace every once in a while, and I'll often at least consider a hybrid economy. In these games, I am even more likely to settle my great people, since I'll probably be in Representation and/or Bureaucracy, both of which reward you heavily for investing in settled Great People. Elizabeth, of course, is downright spectacular at this.
Play around with the corporations and find out which ones are you favorites. I usually build Wall Street in whichever city happens to found the most religions. In games which I found no religions myself and don't have the luck to conquer a Holy City early enough (I hate holding off on Wall Street for long), I usually try to strategically found as many corporations in my Wall Street city as is possible. Consider carefully which corporations you will be founding, what Great People you need to found them, and how to quickly get the technologies required. You might consider, for example, keeping the Great Merchant from Economy and the Great Scientist from Physics, rather than settling them or using them up for a Golden Age. Likewise, even Great Artists can found a corporation, though you'll be saving up that guy from Music for quite a long time -- until Mass Media, in fact.
Even non-Philosophical leaders can found corporations at will; just know when to fortify and when to settle those Great People. And, if you're like me, you probably won't do much (if any) bulbing. The short term gains are great, but I play for the long term. Tanks, nukes, corporations -- I love the Industrial and Modern ages! The Future Age does tend to drag a bit, though...