We had this when I worked in the web-dev team at Dell. Friday afternoons was "personal project" time. I guess they figurued no-one did anything on Friday afternoon anyway. It has to be said, however, that most people didn't take it for anything more than an excuse to not even *pretend* to be working. The few people that took it seriously tended to use it to learn new languages and explore new ideas, rather than develop anything anyone would ever consider useful. This helped their CVs, though, more than it helped Dell - I got some Java onto my CV that I didn't have before, which helped me to get my next job after Dull (sic!).