Is there a way to find all photos in my catalog that I haven't touched up?
My catalog has tens of thousands of photos. I've already rated/marked the ones I like, but I haven't touched them all up. Going through each one to check if it's already been touched up would take too long.
Create a smart collection where you filter for Develop->Has Adjustments
There are a variety of ways to isolate photos without any (or without "sufficient") editing.
Some require a plugin, some don't.
Another easy option for locating unedited photos (which does not require a plugin):
Sort according to edit count.
All those you've never edited will be at the top (or bottom, if it's flipped), followed by those you've only edited once...
Note: an edit is counted for metadata edits too, still..