Ps3 version also outsold 360 version in the US by 10,000 units

I would have thought the Joker content would have counted for more than that.

very impressive

good sales
its a great game

Exclusive DLC doesn't usually help, look at Tomb Raider Underworld.

Beating the X360 in the USA is impressive. I think the game was perceived by the mainstream consumer kinda as a PS3 Slim launch title.

Why?  Just being roughly equal is pretty amazing in the US IMHO.  I fully expected the 360 version to outsell PS3 unless a fair amount of new PS3 purchasers made Batman their initial gaming choice - which may have contributed I guess.

I never saw the Joker influencing anyone but a small minority of dual console owners or people about to buy - no 360 owner was going to buy a PS3 just to get this game and the Joker (or at least not enough to matter appart from some total Batman obsessives).

Oh and there is of course one MAJOR factor called PIRACY on the 360 that will also seriously affect the numbers, until the PS3 gets piracy or the 360 get's it completly stopped you are only kidding yourselves comparing software numbers between two consoles where one has piracy and one does not, only a complete idiot would not agree to that. (or a fanboy but then they are the same thing).......

^^
If you're counting sales that puts money in the developers pockets, then piracy doesn't affect the situation.

Basically, the developers (so far) are seeing essentially a 50/50 revenue split across both HD consoles - for those who wonder about developers favoring one over the other, etc. this is important.

Pirated copies are something else entirely, and if your point is accurate then if I was a developer I'd actually prefer the PS3 to be dominant so that there is less chance of people getting a free copy that doesn't put money in my pocket.

O.o are you serious? Even with 360 piracy it consistently sells tons more software in NA then Ps3. The very few times Ps3 outsells 360 SW thats when you really use the piracy excuse?