This site uses several data sources to fetch the data:
Our major data source is the official iCert portal registry.
Originaly our goal was to make it work in FireFox, but later we added some charts with statistics for parsed data.
Right now all the information about approved cases comes from the iCert registry.
Another source is OFLC Performance Data.
This site contains several csv and excel files with approved, denied and withdrawn cases.
The format is very straightforward, but using it for the search is not easy if you are not a command line guru.
We are using this data source for the denied and withdrawn cases.