By now you've probably heard that adorable laughmeister Jimmy Fallon is slated to replace Conan O'Brien as host of Late Night (boo!) so Conan can take over for Jay Leno as host of The Tonight Show (yay!). Now it looks like Jimmy will get some much needed practice keeping it together before he officially takes over. Fallon will begin his run as a nightly talk-show host on the web, with 5-10-minute spots may begin in the fall, months before his TV tenure begins next year. "Conan needed time to find his show," says executive producer Lorne Michaels. "I think this will help Jimmy do that."