Everyone gets the bug to be their own boss at one time or another, but, as this blog from Seth Godin states, it's good to look before you leap.
You don't realize how much you need a boss until you don't have one. Bosses don't always do the following, especially when they're not very good bosses, but here's what we know about good bosses:
Bosses organize your time for you.
Bosses decide what's urgent.
Bosses give you cover when you work on something stupid ("she told me to!")
Bosses pay you even when the client doesn't honor the invoice.
Bosses can be sued.
Bosses create deadlines, and stick with them.
Bosses make sure you show up in the morning.
Bosses pay for the Postits.
Bosses give you someone to complain about.
Bosses carve up the work and give you just that piece you signed up to do.
Bosses give you a role model.