From the Independent:
http://news.independent.co.uk/uk/politics/article2701305.eceSome snippets:
"The plans to diminish the Treasury and appoint a "new Chancellor" demonstrate the depths to which the relationship had plummeted, and the extent of the distrust between the two men and their rival courts.
It was the lowest point of a steady deterioration that led to shouting matches, slamming doors and angry accusations - a situation that many in No 10 thought frustrated good government.
The tension was so palpable that Mr Blair's aides complained that they were treated like children in a dysfunctional relationship. Estelle Morris, the former education secretary, recently said that "the tension between them made decision-making impossible".
Tony Blair complained that Gordon Brown's influence over domestic policy had stifled many of his reforms. At the 2005 Labour conference, the Prime Minister said revealingly: "Every time I've ever introduced a reform in government, I wish in retrospect I had gone further." "
Brown actually prevented the Blairite reforms to go further to the right - Blair wanted more right wing policies, Brown prevented that happening.
And this on id cards, from the Guardian:
http://www.guardian.co.uk/idcards/story/0,,2078091,00.html"Jack Straw, now widely expected to replace John Reid as home secretary, signalled yesterday that the future of the £5.75bn national identity card scheme would be under review when Gordon Brown becomes prime minister next month.
Mr Straw, the leader of the Commons and Mr Brown's leadership campaign manager, has a long record of personal opposition within cabinet to a compulsory ID card scheme. Sources close to the chancellor, said Mr Brown believed the slimmed-down Home Office needed stability and "Jack is a heavyweight who can hit the ground running"."
As you say, any changes he implements will have to be subtle for diplomatic and strategical reasons, I think he's shown by his words, and his allies words so far that he did indeed disagree with a lot of what Blair said and did.