Top 7 Tricks to get google links
Trick 1: Search for links to particular web pages of a competing site
Alongside with link:www.your-competitor.com search for link:www.your-competitor.com/products.html or link:www.your-competitor.com/services.html and so on.
Trick 2: Exclude internal linksYou may examine the internal linking structure of your competition if you want to gain some insight on their navigation and marketing steps. But as we want to find more external links, let's exclude the internal ones.
You can do this by adding -site:site.com operator to your search query. Type in
link:http://www.your-competitor.com -site:your-competitor.com or
linkdomain:www.your-competitor.com -site:your-competitor.com" and
you'll get a list of external backlinks only.
linkdomain:www.your-competitor.com -site:your-competitor.com" and
you'll get a list of external backlinks only.
There's a dropdown option in Yahoo! site explorer that does the same.

Trick 3: Exclude links coming from certain domains
You can add -site: multiple times in one query so that you have something like this:

Trick 4: Check links coming from certain TLDs
Note: Do this in Yahoo! regular search, not site explorer
Trick 5: Exclude links coming from certain TLDs
This is an even lesser known trick. You can exclude certain tlds from the results with the -site:.tld modifier. Usually the biggest chunk of links comes from .com's so add a -site.com modifier and you'll get lots of new link data.
Trick 6: Use different combinations of the first 5 tricks
Try link:http://www.your-competitor.com/page.html -site:your-competitor.com -site:.com
Or link:http://www.your-competitor.com site:.org -site:wikipedia.org
Give it a thought and I'm sure you'll come up with lots of your own. Feel free to share your findings in the comments
Trick 7: Use the above 6 tricks in different search engines
Don't limit your searches to Yahoo! and Google, go to AltaVista, Alexa, (Bing doesn't give you link data, so forget about it) but then there're Exalead, Excite and tons of regional search engines. Search them, remove the duplicates and you'll have a goooooooooooooooogol of competitor's links to study.



