Nice article over at "Both Sides of the Table" on what it takes to be an entrepreneur. The Author is himself an former business owner that is now doing venture capital. Each of the eleven points links to its own article, which is a nice touch.
There are a lot of books out there that push entrepreneurship like it is a religion and that anyone who is an employee is just a sucker. This is bad policy. Not everyone is cut out to run their own business. Those that aren't and try their hand at it often wind up bankrupt, both corporately and personally. One day I will post about the particular things that I think you should keep in mind before getting into business for yourself. In the meantime, this list of personality traits is a good thing to keep in mind.