Mozilla has the wonderful ability to do keyword substitution in a bookmark. This enables you to easily search different web sites from the location bar. For a tutorial on creating bookmark keywords, see http://www.mozilla.org/docs/end-user/keywords.html
For example, if my everything2 bookmark keyword has the name "e", then I can search for a node on Dread Zeppelin by typing "e Dread Zeppelin" in my location bar. If my google bookmark has the name "g", then I can search google for Dread Zeppelin by typing "g Dread Zeppelin" in the location bar.
Here are some of my bookmark keywords
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Everything2
http://www.everything2.com/index.pl?node=%s
bookmark name: e
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Google
http://www.google.com/search?q=%s
bookmark name: g
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IMDB movie search
http://www.imdb.com/Find?select=Title&for=%s
bookmark name: movie
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IMDB actor search
http://www.imdb.com/Find?select=People&for=%s
bookmark name: actor
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rpmfind
http://www.rpmfind.net/linux/rpm2html/search.php?query=%s
bookmark name: rpm
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Amazon
http://www.amazon.com/exec/obidos/external-search/?index=blended&keyword=%s
bookmark name: amazon
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Dictionary
http://www.dictionary.com/search?q=%s
bookmark name: dict
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Thesaurus
http://www.thesaurus.com/cgi-bin/search?config=roget&words=%s
bookmark name: like
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Weather
http://www.weather.com/weather/local/%s
bookmark name: weather
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Phone number lookup (time zone information given an area code)
http://www.melissadata.com/lookups/phonelocation.asp?number=%s&submit1=Process
bookmark name: phone
- Netflix search
http://www.netflix.com/Search?search_submit.x=0&search_submit.y=0&v1=%s
bookmark name: rent
- Wikipedia
http://en.wikipedia.org/wiki/Special:Search?search=%s&fulltext=Search
bookmark name: wiki
- Diamond comics
http://www.google.com/search?hl=en&ie=UTF-8&q=%s+site%3Awww.diamondcomics.com
bookmark name: d