On 27 April 2006, "for the first time in 18 years, the PAP has not returned to power on Nomination Day" (CNA). For more on the elections, the Elections Department offers a map of the electoral divisions, results of past parliamentary elections, a register of voters (access only to personal records), instructions on voting and on overseas voting
Get media updates from the Straits Times' General Elections page (subscription required and Channel News Asia's GE 2006 webpage. A special section on Yahoo!Singapore News on the General Elections wraps up news from various media agencies. The site also presents the contestants for the various constituencies.
For succinct background information, Wikipedia has an article on this, the most recent General Elections in Singapore.