I'm currently reading Rejuvenile by Christopher Noxon. I'm about half-way through it and it's a great read. It's kind of a pop sociology book that talks about adults who have never given up "playing" or who demonstrate traditionally immature traits (i.e. - adults playing tag, kickball, whiffleball, hanging on to or collecting toys, living with their parents past the age of 30, etc...). Noxon acknowledges that some of these traits can be extremely healthy and just plain fun, and some traits can be unhealthy. His research found that this is not a new phenomenon at all, but merely a forgotton one. He traced the same sort of behavior back to the early 1900s and believes it was probably brought about by the Peter Pan play (check out the Johnny Depp movie Finding Neverland for a fantastic telling of how this play came to be). This is a great read and while it's not a "Christian" book, I think it could be quite relevant to church leaders. (8/4/06, 2:40 pm - I finished this book last night and still feel good about recommending it. Very interesting and sometimes funny.)
I would say that my own rejuvenile tendencies include hanging on to old comic books, a minor obsession with baseball, the occasional game of whiffleball, and a small collection/affinity for SuperMarionation (i.e. - old episodes of The Thunderbirds, Captain Scarlet, etc...).
Feel free to confess some of your rejuvenile tendencies. Leave your shame behind. We are free in Christ and only the little children shall enter the Kingdom, so get it off your chest!