|Mark Rein put it quite clearly that "You'll also be able to share mods between the PC and PS3 platforms". He has also said that the open source platform Sony is using makes this possible. This may make it very unlikely the Xbox 360 will have such cross compatibility.|
Also, don't have a link atm...but it is supposed to have full mouse and keyboard support on the PS3 I hear. If it won't run as smooth on my PC this is good news.