Many of us X-ray LinkedIn from Google. If we are looking for profiles with certain keywords, we use the string
site:linkedin.com inurl:in OR inurl:pub -inurl:dir -inurl:jobs <your keywords here> …
Strangely though, Google forgets to add many words that belong to all LinkedIn profiles as keywords. If you search for “Public profile powered by”, industry, connections, current, past, etc., Google will miss many relevant results. It might be interesting, say, to look for people with few connections using the num-range expression “1..10 connections”; alas, the majority of the results will be missed.
Yahoo does a better job at this; keep in mind though that the Yahoo search engine (initially created by folks at Inktomi) is going away by the end of 2010.