http://lifehacker.com/5841147/the-ultim ... king-guide
The link has some tricks that are more international-specific and talks about racking up miles, but if you really want to be thorough about it you'll want to check more than one of the aggregator sites (like Kayak), and once you've done that, check the airline-specific sites for the cheapest few options you have because those prices often differ from from the aggregator prices.
(Where, When and What Did You Think)
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