Personally, I don't think it should be necessary to get permission to post a game. Anyone can click on other members and see their games anyway.
I do think one should be sensitive in how they annotate a posted game. We all make mistakes, when pointing out those of others it should be done lightly... like "White missed..." versus "White blundered..."
I blog about almost all of my games, and recently I'm reaching a large number of readers and this issue came up, no problem when posting about your losses, but when posting about your wins, is it necessary to have your opponent's approval about displaying his/her nickname, for example, in the game viewer of chess com?
At the moment I'm inclined towards a not asking any permission to reveal their handle even if it's a loss for their side, as all the games played here become part of public domain and anyone can enter their profiles and view the games.
What are your opinions on this? How would you handle the situation if your opponent had posted a blog or forum entry and not hide your nickname in a game your lost against them?