Firefox also has keyword search (i.e. type in "wp something" and go to the wikipedia page for "something") - you just have to define a keyword for an existing bookmark, and then place %s in the URL where you'd like the search term to appear.
Although I did mean FF I didn't realize chrome had this yet. And they do it much clearer then Opera did. I really like the way that it auto changes to tell you that you are about to search yahoo, etc.
Options -> Manage (searches) -> double click an existing search or add a new one -> set Keyword to a single letter.