Yahoo helps you locate people who link back to their LinkedIn profile from somewhere on their blog, resume or other webpage. From the yahoo.com search box enter:

linkdomain:linkedin.com -site:linkedin.com JOB TITLE "at COMPANY NAME"

Replace the words in ALL CAPS with your own target company names and job titles but be sure to keep the "at" inside the quotes as this will help you find people who say they work "at COMPANY" and so on. I also recommend you try alternate job titles and company names. Examples:

linkdomain:linkedin.com -site:linkedin.com "software engineer" "at Microsoft"

linkdomain:linkedin.com -site:linkedin.com CPA "at deloitte"