( click image for full size )
For those of you coming from OSX macs, or just like to use widgets on your desktop, the Opera widgets are really coming into their own now. Click the image of the desktop above to see an example. They have just about everything. Flight tracking, package tracking, calculators, calendars, search widgets, clocks, translators, you name it. These definitely look more professional than the Screenlets apps. You also can make DEB files of the Opera widgets, which means you dont need Opera installed. After downloading a widget and opening it, select "advanced" and checkmark "make deb package from this widget".
UPDATE: For easy use, installed Opera widgets are placed in your "Applications - Other" menu and are easily added to the desktop or panel (or docky).