Xfce 4 Smartbookmark Plugin 0.4.2
Xfce 4 Smartbookmark Plugin was recently rewritten so that it now works with the new panel API.
Some examples: http://www.google.it/search?q= if you want to perform a search on Google or http://bugs.debian.org if something is wrong with your system (assuming your distribution is Debian).
First add the plugin to your panel. Then you can go to the config dialog and enter the base URL you want to use for search queries (see th examples above). Once it’s done, you can just to type in some keywords and press ENTER and the plugin will open your web browser and perform the search on the URL you’ve specified.