Surprisingly (at least to me), I haven't seen this diaried. To me, this seems huge.
According to Politico as posted on the Yahoo news front page, John McCain had decided to accept public financing for the general election. See
http://news.yahoo.com/...
I think this is likely to place McCain at an insurmountable disadvantage. With Obama's demonstrated fundraising ability, he is now likely to be able to outspend McCain by about 4 to 1 in the general election. Of course there will be the 527s and the RNC to contend with, but in a national election, money talks and Obama's got a huge megaphone.