You can do the same in Chrome. Check under Options ("Basic" tab) > "Manage" next to Default Search. You should see a list of search engines. If you've already used the search engine and Chrome has picked it up, just select it from the list, "Edit", and customize what keyword you want to use (by default it uses the basic URL). If it's not there, "Add" to make a new one.

For example, for Wikipedia I use: Keyword: wp URL: http://en.wikipedia.org/w/index.php?title=Special:Search&...

Here's the Chrome help page about it: http://www.google.com/support/chrome/bin/answer.py?answer=95... It tells you to use Tab to search, but typing just the keyword and search term works fine (e.g. "wp Google" to look up Google on Wikipedia).

Go into your search engine manager (via options or the omnibox's context menu) and edit the keywords for your chosen engine - note that we automatically add engines here with the keyword as the domain, so if you do a search on amazon.com, we'll automatically add amazon with the keyword 'amazon.com' - with autocomplete, this lets you type 'am', then press tab to search (or space-separate the keywork from the term).

This can also be done in Chrome, see other responses here. What Chrome also does is that it discovers searches by itself, so that when I type "im" and the autocomplete brings up imbd.com I can press tab, my search word and enter. There is no need to manually add the keywords.