I often use Google advanced search parameters. It helps to find target information in shorter time. in addition, irrelevant information can be easily removed from the search results. Here are some examples:
“security” site:ibm.de (security relevant information from ibm.de domain)
“security” site:com (security relevan information from all .com domains)
inurl: To filter results according to certain keywords in url
inurl:security (all web pages which contain the keyword “security” in their urls )
inurl: security site:ibm.com (all web pages from ibm.com which contain the keyword “security” in their urls )
ext/filetype: To filter results according to file type
security ext:ppt (security presentations)
There are other parameters as well: intitle, intext, cache etc. For more details, see http://www.googleguide.com/advanced_operators.html
