Resources on Data Science for Football / Soccer?
There's this website called Sportsdatamart which allows you to
download CSV and XLS file formats for a number of Football series
like the England Premier League, the Italian Serie A, the German
Bundesliga and the Spanish La Liga. 
On Football Data UK, you can find EXCEL and CSV data files to
use for quantitative testing of betting systems in spreadsheet
applications. League tables, head2head statistics and information on
goalscrores, first scorers and top scorers could be accessed through
the Livescore service.
Soccer Wiki is a collaborative database and anyone can create
and edit data. This community driven database contains information
on players, clubs, stadiums, managers, referees, leagues and other
data related to the world of soccer.
If you are looking for data sets centered on European Football,
check this out.