I was thinking, wouldn't it be cool if there was a DVD focusing on celebrities who made multiple appearances on the show? Maybe grouping the sketches by celebrities, with most or all of their featured appearances (not cameos in celebrity montages) on the show. Not sure about whether I'd put their appearances in street stories (I know Madeline Kahn was in two street stories, for example). If I was in charge I also wouldn't put in celebrities whose only appearances outside of one isnert is a "Word of the Day" explanation sketch.
But I would include all or most appearances by James Earl Jones, Pat Paulsen, Bill Cosby, Lena Horne, Johnny Cash, Madeline Kahn, Judy Collins, James Taylor, Ray Charles, Mel Gibson, Robin Williams, and Whoopi Goldberg. I realize there are other celebrities who made multiple appearances on the show, but think that would be a good selection of celebrities. Don't know what a good title would be ("Celebrities Who Visited Sesame Street Many Times"?). Not sure if we would need every appearance by all those celebrities (with the exceptions fo Pat Paulsen, Mel Gibson, and Robin Williams, all of them have appeared on Sesame Street DVDs in the past, some guests like Judy Collins may have made too many guest appearances, and it could be hard to clear Ray Charles' "Oh, What a Beautiful Morning" or James Taylor's "Up on the Rooftop").
For bonus features, it would be cool to have a special feature about these guest stars appearances, and maybe new interviews with some of them (I think James Taylor and Judy Collins would do interviews, and maybe also Whoopi Goldberg). But maybe it could also have a "before they were stars" feature, including segments with Raul Julia (Rafael), Alan Arkin (Larry of "Larry and Phyllis"), Paul Benedict (The Mad Painter), Charollete Rae (Molly), Savion Glover, and maybe also some stars who appeared on the show as kids (like that kid from Everybody Hates Chris), plus bonus segments with Buffy St. Marie and Ruth Buzzi. And maybe also a selection of bonus Kermit the Frog segments (since Kermit is often referred to as "Sesame Street's number 1 guest star").