Well, you could start off by sending them an email asking them to take it down, seeing as how it was posted there without your permission. Thing is, I can't really find any contact for or other details on the website. The tiny footer claims it's a project by "Zaia Design", who are located in Hong Kong (in other words: good luck with that...)
I just had a quick look in the App Store. They charge for the app: $2.99 for the standard version, and then there's $1 versions that are apparently limited in the scope of maps that are offered, e.g. one with just subway maps, one with just Australian maps and so on. The screenshot in the app store show maps by the National Park Service, Transport for London, City of Vancouver etc.
The website offers a search function, I have found some other maps done by Cartotalk contributors:
http://mobilemaplets.../showplace/7964 (Kevin Paul Scarrot's Stavanger map)
http://mobilemaplets.../showplace/6342 (Matthew's "Bike There" map)
There may be more. I wonder whether or not the people running this got permission from the copyright holders...