TimesOnline recently published a list of the top 50 thinkers in business for 2007. You can read The top 50 thinkers - Times Online or visit thinkers50.com to see the list.
These are the people to whom the herd think you should be listening. It is worth being at least aware of what each of them are saying. More interesting, I think is guessing who will be on the 2009 list - where are the new ideas coming from. You can start to vote at thinkers50.com already.