Is there web-based software for annotating a set of PGNs that I have? Or is there Mac client software for accomplishing the same?
Notepad... oh, nevermind. I guess you could take it to the Apple store and see if they will do it for you?
What do you mean by annotating? Computer evaluations?
Maybe because your asking about web-based or something, but couldn't you use chessbase to use pgn files and annotate them ? Thats how I'm doing it.
Here's a discussion on that subject in case you haven't already seen it.