Reading through the posts on this thread, I think there is some pretty harsh stuff being thrown at Paulo....Evo has some very good points.
I mean, come on!, this is not the 1930's, we are not all bombing around in Tiger Moths and we have VHF radio which is there for us to use. Its as simple as that!
See and be seen is one thing, but if you have a resource available (and already stated on here by someone) why on earth not use it? As long as it doesn't override a thorough and continuous visual scan and instead compliments it, I think it can only add to safety.
In my part of the world there are many uncontrolled airfields that have no A/G or FISO and "traffic" calls are mandatory in many places. They are invaluable and give one a good heads up on traffic in the area and its position / type. Having done a lot of flying in the UK, I have experienced several times some fairly close contact in some non radio situations. Assuming both parties had been happy to use some sort of reporting system, VHF could have helped a lot.