Not only can you add search buttons, you can also add custom search fields. So, just drag any of the following to create a new search field in your Start panel or any other toolbar!
Search RFCs
Search Google Groups
Search Opera Support
Search IMDB
And now for the goodies, where I tell you how to do this yourself. ;) The buttons and search fields are regular links, with the href set to a custom URL. The URLs are of the format "opera:/edit/Search, "search-URL"" or "opera:/button/Search, "search-URL"" with the title attribute and link text set to the button/field name. The spaces and double quotes have to be escaped, so they come out as %20 and %22, respectively. Just copy one of the links to have a look at how they're put together.
