Title like "10 Tips For Job Interviews" are excellent for getting people interested and clicking on your SERP.

But, nobody really searches for them. They just expect "top 10 tips for job interviews" to be one of the results for "tips for job interviews."

If you're going to head this route, try "top tips for job interviews" without a specific number.

Also try non-numerical qualifiers like "good tips for job interviews", etc. The keyword tool is your friend here for brainstorming purposes.

Qualifiers that don't register much Google Adwords Keyword Tool are also good to use in content instead of creating their own page.

When you go to example.com, does it automatically refer the user to www.example.com?

If not, that would fix the issue without having to mess around with Bing Webmaster Tools. Go to http://www.seomoz.org/learn-seo/redirection and scroll down to the Redirecting Canonical Hostnames section.