I can’t believe there isn’t a place to search the PHPDoc’s generated for Magento so I decided to make a custom search for it through Google’s custom search gadgets, It’s not pretty but its basically the same as just doing the following in Google’s normal search(minus double quotes and inserting your keywords where <yoursearch> is of course):
“site:docs.magentocommerce.com <yoursearch>”
It merely just searchs through: 
Magento Documentation (phpdoc).
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Wow, that’s pretty cool.
I used to spend a lot of time browsing through the Magento docs looking for what I needed.
What I can’t believe is that I never thought about doing this myself.