Its great news they are finally doing this. I've already completed and sold 2 or 3 games before the Trophy patches came out, which is really annoying, as i would have liked Trophy support whilst playing them.
At least we can be happy that next year, every game will have them, so people arent going to miss out. Trohpies arent critical, but they do add a fun and challenging edge to games, and its good that Sony have made this announcement, it made me very happy.
what i'd love them to do now is add value to the Trohpies, maybe make it so that every 250 or so Trohpies you collect allows you to download or access some cool features for your PS3. Or make them redeemable for money off downloading PSN Games. Something like that would be brilliant.