I use Google as my primary search engine. However, nowadays, more often than not, I tend to use Yahoo! Search too. After I search using Google and I’m not satisfied with the results, mind you. So, a Greasemonkey script that does this:

Notice the Yahoo! among the tabs. Simple. Useful. You may install the script from here.
Edit [11:58, 13/05/05]: One of the comments to Jeremy’s post mentions Butler—way more comprehensive, etc. I should look for stuff before I hack my own, ya know.
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2005-05-12 10:52 am (UTC)