This website was in the Guardian today, and it is an open source project which, using some data from the Royal Mail aims to show where every postbox in the UK is, but it needs users to locate them on a map.
Its quite good, and I think its a very good idea, so go and add the postboxes near you! Visit http://www.dracos.co.uk/play/locating-postboxes/ and its all free and easy and it might be really useful to you one-day!
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I’ve been using an ipod / iphone app called “UK Postboxes” http://smlr.eu/1o which does this. It’s been great in and around London, and seems to be improving its coverage out here in the sticks rapidly. You can also submit boxes although I haven’t done that myself.