Thanks for the responses so far.
I know LR3 has the Tone Curve, but Aperture has Curves (R,G,B, RGB) and Levels (R,G,B, RGB, Luminance) that are like the tools you would find in Photoshop. LR3 doesn't have these.
In Aperture, Recovery & Brightness are similar to the Recovery & Fill tools in LR3. Lightroom does not have a tool that directly compares to Highlights & Shadows. What I am trying to figure out is if I can achieve that same effect in LR3, or if it could only be matched in Photoshop. It's entirely possible that LR3 can't do it and Adobe wants their customers to go to Photoshop for more advanced editing - similar to them including a spot removal tool instead of an actual clone brush.
Anyway, I have used both programs extensively for over 1 year, and I know them both pretty well. Highlights & Shadows is one of my favorite tools in Aperture and I would love to be able to do the same thing in Lightroom. Just thought another user of both programs may have figured it out.