let's assume that you need a serial number for windows xp pro.

in the search bar type - "Windows XP Professional" 94FBR

the key is the 94FBR code.. it was included with many MS Office registration codes so this will help you dramatically reduce the amount of 'fake' sites that trick you.

or if you want to find the serial for winzip 8.1 - "Winzip 8.1" 94FBR

just try it out, it's very quick and works nicely..

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here is another trick that works fairly decent for finding mp3's on the web (which is hard to do normally,

say you want to get, for example, a Linkin Park song. type this in the search bar - "index of/" "linkin park" .mp3 the ones you want to check out first are the ones that say "Index of/" in the title of the search result. this technique allows you to easily pull up web folders with direct downloads. it will look the same as if you were logging into a ftp url.. you can be pretty flexible on how you type that in, so long as you include "index of/"