Yeah, I got the Riddler trophies. Have you all checked out the Joker audio tapes on his stats page as well?
Couple of cool things I noticed:
1 - the cape move. Middle mouse click on the pc.Uses the tip of his cape to blind enemies. Very cool.
2 - When the Joker is doing the speech on the monitor at the start I threw a batarang at it. Shattered the screen but it still kept playing, although fragmented. Thats a nice graphical touch and shows the levels of detail they are putting in.
3 - Upsideown takedown of bad guy. Swing across room. Wait till other thugs underneath. Cut rope with batarang. 2 for 1.
4 - Ramping up the fear. When you are in the last big room taking out the guys there, mess around with the last one for a while. He totally loses his shit and starts firing randomly and panicking. The whole intimidation thing was a large factor in my love for the Batman Begins game. They've taken it to another level here.
And if you think Harley was hot... have you seen Ivy??
http://www.youtube.com/watch?v=Hyk99LlWOig