Mash Ups are an interesting thing. On one hand it is the pinnacle of online creativity, when done well, and on the other hand it is hard to distinguish copyright issues and how much credit the original should get when the mashup becomes more popular or successful.
Mashups can happen in all types fields. Applications, music, video games, blogging, photography, and much more. A mashup is a clash of information of two separate things into one thing. This could be a remix to a song or even a remix to an application’s functions. The IBM article talks about how many different uses there are for Google Maps. I find this to be cool.
Personally I welcome Mashups because they could improve upon an original idea despite that it may infringe on some copyright. I feel that if the person is using the tech or idea in a which the original creator never intended to then it should not be a problem. When I post a blog post on my personal blog I use photos and videos under the protection of fair use. I don’t use the photos to maliciously try to profit off of someone else’s hardworking but just because it helps me to prove a point or makes the post stronger. Kind of like when you include sources in an academic paper.