Parliamentary elections are due to take place on the 15th October. Here are some useful links for tracing background information on the lectoral system and past elections. The IFES election calendar has basic facts about the electoral system and information on past elections from 1998 onwards.
The Ace Electoral Network project encyclopedia also has a good collection of basic facts Plus useful RSS news feeds from good resources.
If you are looking for past election results a good starting point is the European Elections database from 1990 onwards.
The Czech republic also has a web archive. This contains a number of thematic collections coverign previous elections. Here you can find archived versions of websites.
The Electoral Commission has its own website which contains reports and results from the mid 1990s onwards.
Political Transformation and the Electoral Process in Post-Communist Europe was a joint project of the University of Essex, ACEEEO (Association of Central and Eastern European Election Officials) and IFES (International Federation of Election Systems). It aimed to provide access to information on the legal and political transformation of the electoral systems of former communist nations. The section on the Czech republic include laws, statistics and reports from 1990-2002
The OSCE has monitored past elections. Find reports on their conduct from 2002-2010