Yeah it's good for following journalists too, as they quite often post links to interesting articles, blogs etc. Sid Lowe from the Guardian football site is pretty good.
I follow about 160 celebrities in total. A few footballers - Maurice Edu, Jody Craddock (who posts some of his art) and even Diego Forlan. The downside to him is he selfishly tweets in Spanish, the upside is that he posts photos like an excellent one of the Uruguay players having a barbecue in between world cup games.
Stephen Fry is really boring as has been said.