I think one of the important items to pick up from the article is that Userful has packaged up a technology - that any one of us is familiar with - and created

I think one of the important items to pick up from the article is that Userful has packaged up a technology - that any one of us is familiar with - and created a consumer product from it. Much like Dropbox has done, the average consumer is very interested in a solution that abstracts away their problems and "Just works" No doubt there are a ton of opportunities in those spaces.