I remember hearing the "Google-fu" expression forever ago on the Coding Horror blog. While my Google-fu may be a little stale, here goes what I use quite often.
Can be quicker than your firing up the calculator and typing it there.
The graph displayed along is quite nice.
No need to navigate to translate.google.com just for that.
Watch out because pdf files can be dangerous. Always double-check the URL.
Quotations and asterisk goes together just like... oh well.
I've used DDG for quite a while in the past and I remember fondly how smart some of its replies can be: