So far, the best I've come up with for doing a competitive analysis on links is to use yahoo's site explorer.
I enter the URL of the page I want to analyse for the true number of IBLs, and qualify the search using -site:
www.xxxx.com so that I don't get internal pages.
For IBLs from other domains to my competitors, I'll be looking at the sites to see if I can beat them with better quality IBLs, but for general analysis should I include the competitors internal URLs? Are they actually helping them?
I daren't mention PR, I'm not even sure if I understand it anymore.
(EDIT, just came across this-
SEO Theory
If you’re going to use Yahoo! for your link research (a generally bad idea, especially if you’re concerned with Google’s search results), then make sure you eliminate as many backlinks as possible. You don’t want to see internal links in a Yahoo! backlink report. You don’t want to see more than one link per domain in a Yahoo! backlink report. If you can figure out how to get rid of the bogus, non-existent backlinks that Yahoo! reports, you may actually find some useful information.
Most SEOs are not aware that Yahoo! reports false links. Yahoo! will show you links it scraped from Javascript. Do not ever, under any circumstances, for any reason, bet your competitive advantage on a Yahoo! link report. You’re a damned fool to use one in the first place but if you’re just looking to see who is building links it MAY give you an indication of relative link strength.)
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