Lightroom v ACR/Bridge for a talk
Is it true that LR 4 and ACR7 (or LE3/ACR6) are effectively identical apart from the user interface and the fact that LR can also process JPEG, TIFF and PSD formats?
You might not be aware that ACR with PSE9 (at least) can also process JPEG, TIFF and PSD formats. In PSE chose Open As and select RAW. The dialog box shows all image formats, not just the ones listed as RAW. Any file selected is opened in ACR.