Manta scrape bot, Yelp scrape bot

What would be some good features that a Manta scraping bot would have?
And, what would be some good features for a Yelp scraping bot?

I have had the idea to make these types of programs for a while now, but have given no real hard thought as to what would be valuable to people. Would just grabbing business info, phone number, names, etc, be good enough? Like for code callers and such, or would there be any other things to go after?

Aside from the usual proxy and user agent selection, what other utility features would be good for such tools?

Does anyone know of any current tools that are already out there, to get ideas off of? I am not looking to compete with existing programs, I really just want to build such bots for my own study, and perhaps see what the market for them looks like.

I have a long list of program ideas to do, so I just want to bang out the boring ones first. Any help and/or ideas would be greatly appreciated. Thanks!

Did you ever end up building this?

For Manta it would be amazing if you could input a list of keywords and cities that it would just run through and grab the business information. Name, website, email, etc.