ZydoSEO - 1:46 am on Jul 13, 2010 (gmt 0)
Agree with wheel. Absolute URLs have lots of advantages not the least of which is that it makes it harder for your site to be scraped.
If you're going to use relative URLs, always opt for "root" relative URLs. By this I mean the relative URL should start with "/" and contain the complete path from the root of your web down to the page to be displayed like "/somefolder/somepage.html".
Using folder relative URLs like ("pagename.html", "./pagename.html", or "../pagename.html") makes it a piece of cake for someone to scrape your site. They don't have to fix a single URL in your code to have a site like yours up and running in no time.