WorkinfoNET  calls itself the primary source of career, education, and labor market information for Canadians. And although we'd like to think that ca.nextwave.org is that (at least for the scientist population), this site comes close: Although the content isn't specifically targeted at scientists, it's pretty good.
WorkinfoNET is divided into seven basic categories: Each of these is chock-full of information, advice, and tips on finding a job, selling yourself, and education programs that might make you more marketable.
"Jobs, Work, and Recruiting," the first section of WorkinfoNET, contains a huge amount of information on everything from applying for jobs electronically to geographic relocation within Canada. Here you'll find "Canada's Guide to Career Planning," an article on career management on the international market, and information on immigration to Canada, should you be from out of the country. This section is almost a site in and of itself, with tons of information and links to job banks and other online job-finding resources.
"Occupations and Careers," the second section of the site, offers an equal amount of information, on the topic of career planning. The information includes sector-specific career statistics and a large number of links to professional organizations that might be of help in your search.
The other five sections of the site--"Learning, Education, and Training," "Labor Market Information and Outlook," "Self-Employment," "Workplace Issues and Support," and "Financial Help and Resources"--offer a similarly immense amount of information, links, and resources for each of these categories.
The first thing you'll notice about the site is that it's quite deep: There's a lot of information here. The second is that, although the layout is simple, it's quite unique--instead of having a "links" page, links to information on other sites are given the same importance as original articles. It seems it doesn't matter whether they're pointing you to information somewhere else or to information on their own page, as long as the information is getting to the reader. I think we'll start to see this kind of architecture more often on Web sites, as it makes it easier to organize and disseminate information, regardless of source.
In short, a colossal amount of information on careers and career trends can be found here.