Now that StartupNews has become HackerNews, expect XKCD to get to the front page 3 times a week.
I never had the pleasure to use one, but one of my professors in college said that when the old Lisp Machines started garbage collection you just went home for the day. Of course, even that was still more productive than using the competing systems ;-)
i constantly get distracted at the day job when i have to compile, like now ;) it's amazing how much more focused i stay with a repl. (and a better language than C#)