I've been trying for years to become a professional writer. To turn my comedic ability into something that will, well, pay the bills. I have taken many seminars and writing programs in the city but never really felt that I was getting much out of them. That is until I became involved with Writers Bootcamp. I am in their 22 month Think Tank Program and am just about to finish my second screenplay. It has helped me become much more efficient in my writing - it truly teaches you how to become 'professional' in your writing. Although the goal is to get an agent or sell a script (BOTH!?) by the end of this program, the skills I have learned are enough success for me. It's not for everyone - expensive (though not as expensive as getting a M.F.A. would be) - and they are big on their own way of breaking down a story (leave your Robert McKee books at home). But definitely check it out. You can try their 6 week Bootcamp Program if you're a beginner, or commit to the Think Tank if you have more experience.