You don't need to worry about some sort of duplicate content penalty for using the same image/filename all over your site. This is common practice, for example, Amazon uses the same logo image file on every page of their site.
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Best posts made by stevenmusumeche
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RE: Image file name, is it importantposted in On-Page Optimization
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RE: Site-wide footer links or single "website credits" page?posted in Web Design
I think the advice in that article is still relevant today. Create a footer link to the "website credits" page, and give yourself a link from THAT page.
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RE: CGI Parameters: should we worry about duplicate content?posted in Technical SEO
Yes, you can say CGI parameters = URL parameters. I don't think many people refer to them as CGI parameters anymore though.
To answer your question, yes, as long as you have rel canonical set up correctly, then the URL parameters won't hurt your indexing.
For example, if you have your rel canonical set to http://mysite.com/japan.html
Then, only that page will be indexed, even if there are various parameters such as
http://mysite.com/japan.html?source=something&whateva=somethingelse
Just MAKE SURE to setup rel canonical correctly because it can be bad if you don't. Check out Dr. Pete's post about this: http://www.seomoz.org/blog/catastrophic-canonicalization