Welcome to the Lightroom Queen Forums! We're a friendly bunch, so please feel free to register and join in the conversation. If you're not familiar with forums, you'll find step by step instructions on how to post your first thread under Help at the bottom of the page. You're also welcome to download our free Lightroom Quick Start eBooks and explore our other FAQ resources.
I've just updated my ACR to 4.6 as I've now got the full LR2.1 and now, when I export a RAW file to PS3, it opens it directly and not with an ACR window.
Beforehand if I exported a RAW file to CS3 it opened in an ACR window first of all and then gave me the option of canceling, saving or opening in CS3 (after all the PP adjustments). Now it just opens as a normal picture would. I am happy whatever because I can use CS3 to PP to my heart's content.