A good piece of advice a friend of mine gave me (a friend who’s well paid and in a top job) is to use the job boards often. Even if you aren’t looking for a job, just check every so often to see what’s in demand. This you can use to help steer your career. It might be that you’ve been pushing hard at Prince 2 when everyone is going over to Agile, or you find Information Architecture is where the money is and you decide to ditch the account manager pathway.
In the digital sector Monster, planet recruit, jobserve IT are good. For those based in Bristol try contacting Ad-Lib or checking the Bristol Media job board, for those in London check out chinwag.