I use a combination of Lightroom and photoshop. I have aperture, just never got into it. Lightroom is good for batch editing and basic post-production that you would do with event work or a studio shoot...working with a large number of photos with similar lighting/settings can be quickly corrected, then individual edits, tweaks, crops, effects all can be applied. Lightroom is also non-destructive editing, which means there are no final mistakes.

I use photoshop to correct specific post issues, like blemishes, unwanted people, drop out backgrounds, layered gifs for web purposes, and mostly to prepare things for web viewing in the web-design portion of my work. Photoshop is destructive editing, unless you save each iteration as a new file.

Aperture works much like Lightroom, but I don't find the workflow to be as intuitive as Lightroom. Also, the number of amazing effects you can get from free or purchased plug-ins for Lightroom are really great for getting that image "just so", often saving a not-so-great candid shot with strong elements.