Common queries:

So how will you effectively use Google. Take this example. A friend of mine was asking me over yahoo messenger what is a blog. I told him to search on Google and find out. He tried this.
blog

Alas the answer was there but lost in thousands of links. He alerted me that he can't find an answer. I told " Ok , Let me see What is wrong? ". I tried this

What is blog
The answer was right there.

While formulating search queries you must be specific as far as possible. A query like Linux vpn howto can yield a different result than vpn howto. Google seems to be intelligent enough to understand some human thought chain. So while making queries be a bit descriptive and formulate a properly worded query. Google ignores some of the common words such as 'the' 'and' 'a' etc while performing a search.