Today could be a day of change, but it will not be one if David Cameron becomes Prime Minister. Neither will it happen if New Labour continue in the same fashion. The Lib Dems may offer some hope, but they are a London centric party which is tied up with the establishment and will bow down to the bankers and media bosses eventually. However if we are to prevent the Conservatives from giving Rupert Murdoch carte blanche to monopolise the media in Britain as can be seen by the Tory attacks on the BBC which echo News International (This may explain the Today programme's emphasis on "Cleggmania") It is vital that the next goverment is not Conservative. So in some circumstances in England I advice people to judge the Lib Dem or Labour candidate and if they have an individual progressive agenda and if they have fought the campaign honestly (Though I expect few have), then I suggest you vote tacitly against the Tories but if not then Vote Green.
In Wales and Scotland vote Plaid or SNP or Mebyon Kernow in Cornwall.
The only Parties that offer a major change are Plaid, SNP and Greens (and MK).
I sincerely hope the Greens win at least one seat: But after tomorrow if there is going to be any change in Westminster they must seek to work together as a progressive alliance.