For future reference, things like this are easily found in the "Help" function in the Finder too. Can often save time over posting a question and waiting for replies. In this case just entering "removing dashboard widgets" in the help search function returned the following procedure:
"Removing Dashboard widgets
You can remove a widget from your computer if you installed it yourself. You cant remove widgets that came with Mac OS X from your computer, but you can remove them from the widget bar.
To remove a widget:
1. Press the F12 key to open Dashboard.
2. Click the Open (+) button to open the widget bar.
3. Click Manage Widgets.
4. To remove a widget from the widget bar, deselect its name in the list.
5. To remove a widget you installed yourself, click its Remove (-) button, and click OK."