A classic never dies, and Grover and Oscar the Grouch are as popular now as they were when you were glued to the television. When you were a babe, however, Big Bird and crew weren’t able to come alive online, as they are today, thanks to SesameStreet.org. For an afternoon of rainy day fun, simply log on and try some of the activities on Sesame Street’s new Web site. You can meet the Muppets, play games that involve Elmo teaching toddlers about potty time and even watch beloved clips from the show. This is the perfect opportunity to introduce your preschoolers to the computer and to simultaneously give your flat screen a rest. Simply aim your mouse and click away, and you’ll be singing the theme song from “Elmo’s World” in no time flat!