I saw in the Ubuntu phone app tutorial that the fetcher in the currency converter is from ecb's web page. Do you know if that data can be legally used in a real app or web page? I suspect that data from other pages such as Yahoo finance (they also have a currency converter among other things such as stock data) can't be used because Yahoo! has stated on their web page that "By accessing the Yahoo! site, you agree not to redistribute the information found therein.". I'm sure that the Ubuntu Mobile OS will be a great mobile os!
The use of the data is documented on the ecb stats page. From http://www.ecb.int/stats/html/escbstats.en.html: