Many organisations collect data on elections and present the data on their webpages. The scope of the webpages is diverse, but they have their non-glossy, but information-packed interfaces in common.
Here are some good sources:
You´ll find the newly completed Danish elections thoroughly covered in figures on the Statistics Denmark homepage.
The Global Elections Database is a dataset collected by Dawn Brancati of Washington University in St. Louis. The database does not cover all countries, but will let you investigate the parties’ election results from year to year, on a regional level, in many cases. Here is an example.
The European Election and Referendum Database is a similar database, specifically intended to provide election results on a regional level for European countries. The archive covers the period from 1990 to the present and publishes results from parliamentary elections, European Parliament elections, presidential elections, as well as EU-related referendums for a total of 35 European countries.
The intergovernmental International Institute for Democracy and Electoral Assistance (IDEA) collects data on a range of parameters, voter turnout, voting age population etc.
The ACE Electoral Knowledge Network writes reports and collects data on electoral systems and results and writes down-to-earth reports on, for example, worldwide experiences with e-voting. It is a good student resource.