I am reminded of that great Gore Vidal quote that goes along the lines of
'Don't vote - it only encourages them'
Personaly I would like to see an option of 'none of the above' on ballot forms. I rarely voted in the UK, not because I was too lazy or unconcerned to do so, but simply because there was no one that I wanted to vote ofr. I would have voted however if I could have actively shown that there was no one that I wanted to vote for, if you see what I mean. A general election where the biggest single 'winner' was 'none of the above' would send a pretty clear signal to the existing parties imo.