Yep, you can do most of what I do within Bridge as well, I just feel LR makes it easier for me. Then I'll import them to CS4 and do whatever final touches I want. Cloning stuff, resizing, etc etc
Also, Light Room is great for importing, organizing and making small adjustments. I'd still use CS4 over it any day, and much prefer Apple Aperture over LR (for those of you with Macs) for it's simplicity.
I dunno... I have an Aperture 2 disc image lying on my external waiting installation. I've been using iPhoto since it started supporting RAW and then using CS3/4 for any editing.