If you know partially or very little about Switzerland here are some key information: 

Surface: 41'285 km2 
Population: 7'593'500 (2008) 
Density: 190 people per km2 (2007)
Official language(s): German, French, Italian, Romansh
Capital: Bern Government: Federal State
GDP: CHF 67'223.- (2007)
The five largest cities: Zurich, Geneva, Bale, Bern, Lausanne 

A few links:

Switzerland – Wikipedia          Federal Authorities        The Swiss portal