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As html both are correct, the /> is a standard close tag, however browsers and crawlers do not require the "/"  to know the tag is closed. In XML you would close the with a standard close tag . That should answer the technical question. I also want to mention something about what you wrote. "I want to use it on pages that rankes together with the frontpage in Google, but i only want the frontpage to rank alone and to have the link juice from the other 2 sites direct-ed to the frontpage.." You should understand the purpose of Canonical tags is really used to keep pages from competing with each other. A good example is if you have a page with info but you also want to give users a printer friendly version (you don't want those pages competing). If you have two pages with stronger content then your home page for "Keyword X" you could be doing yourself a dis-service by trying to rank a weaker page.

Hi Carl What to do now when Google have banned the site.. all the keywords is on page 6, is it possible to get the site back on the track again!!

Hi Peter, Did this answer your question, or are you still looking for some help?