The Consumer Action Group (Bank Action Group) - the leading and best online forum for reclaiming bank charges in the UK (free registration required to access all areas)
Money Saving Expert - Martin Lewis' excellent self-help website, which provides free advice and support for reclaiming bank charges.
Bank charges may be illegal: study (pdf), 21 December 2004 - Business press article on a report from the Consumer Law Centre Victoria (Australian banks charge 64 to 92 times more for debit dishonour than the cost to process).