Tonight's the night. Conan O'Brien debuts as the new host of the Tonight Show. This has been the plan for nearly 5 years, and hopefully the transition goes smoothly. O'Brien definitely has a different style that Jay Leno, and some have said he will need to do some growing up before he can really take the helm. Here's hoping that's not true. If O'Brien changes his style to accommodate the critics, he'll lose what made him the man picked to replace Leno. I'll definitely be watching tonight to see how he does. A good litmus test for the tone of the new show will be first guest Will Ferrell, who has a history of stripping down to green tights on O'Briens previous show. I wouldn't be surprised to see it happen again tonight. It would definitely get the message across that Conan isn't going to change.