Sean (no relation) over at the always-interesting Park Paradigm is thinking about the relationship between the semantic web and financial (numeric) data : Semantic shemanticrich open data is what we want.
The world is literally awash with very, very useful scalar data types. The big gorilla being integer and fractional quantities that change value over time. I firmly believe that in order to make these things first class members of the Web, they need to live *on* the web.
Simply put, numbers need URIs with RESTian APIs for management. Lets put that layer in place first. Then we can make RDF statements about numbers (and numbers at idempotent points-in-time). We can also provide feeds that describe time series changes using things like XBRL...
That is what the www.timetric.com is all about.
 Financial markets love fractions, as do market makers of all forms horses, two-flies-on-a-wall etc.