Important: some of the links don't work, you need to copy them and paste them in the URL box!!!
Overview
Balance politics
The best website to start your research. It presents the arguments for and against immigration in a clear table! This site is THE place to have a full overview of the different arguments on both sides.
http://www.balancedpolitics.org/immigration.htm
Wikipedia Pros and cons
Arguments for and against immigration, with an accurate analysis of the debate.
http://en.wikipedia.org/wiki/Opposition_to_immigration
Bad arguments
This website offers a list of bad arguments used in both side of the debate. It allows you to find interesting counter-arguments to these poor arguments. A must see for the debate.
http://www.rateitall.com/t-21909-bad-arguments-about-immigration.aspx
In support of immigration
Immigration debate
This is an excellent website to develop your arguments in favour of an open immigration, but unfortunately this is an American website based on American data.
http://www.immigrationdebate.com/
Newsbatch
An excellent website with many arguments, but also with a great number of links to other sites advocating immigration.
http://www.newsbatch.com/immigration.htm
Nashville Buisness Journal
This resource can help you support your economical arguments in support of immigration. Unfortunately, it is presented as a newspaper article and you need to search in the text to find what you need.
http://nashville.bizjournals.com/nashville/stories/2006/01/09/editorial1.html
In support of a restricted immigration
Canada First
A Canadian website created to convince you of the dangers of immigration, a good place to find striking arguments.
www.canadafirst.net/case_against_immigration.html
Focus on the family
This is the leading organization against gay marriage and for traditional Christian values. This is an American website, but there is a Canadian section, if you wish.
http://www.family.org/socialissues/A000000464.cfm
Canada the sinking lifeboat
This blog exposes the problems of immigration and how it will affect Canada and its long term effects.
http://www.sinkinglifeboat.blogspot.com/
Dispatches of the Hogtown Front
This Canadian blog demonstrates how multiculturalism and high immigration will change Canada's face. It also offers a great number of links to anti-immigration resources.
http://hogtownfront.blogspot.com/
Canadian Demographics
A Canadian website devoted to explain how demography will be affected by immigration and the problems related.
http://www.ramacresearch.ca/Demography/BobsBlog/Demography.htm
VDare
An American resource discussing different aspects of both legal and illegal immigration. It mighr be too specific, but it offers several in-dept articles regarding immigration.
http://www.vdare.com
If you have any other website that you think could be useful or interesting, let me know, thank you.