I have a Google doc with the same exact title of "Ideas." Yours is far more extensive though.

I've had this going for a year or two now. It's hard to come up with ideas when you want them, and they seem to come to you quickly when you don't need them or once you've started paying attention to problems. By no means is my list complete or good, but I've found it helpful to write them down otherwise I'll forget them.

You got some good ideas in there. I love your Yelp idea!