Widget Update is a free Dashboard Widget that can automatically check for updates to the all the other widgets that you have installed. It supports Apple’s software directory, DashboardWidgets.com, MacUpdate and Version Tracker. It will present you with a tidy link list of all the updates found, enabling you to read release-notes and download the the updates quickly and painlessly.
Pros: Widget Update is a much-needed widget, with a simple and easy-to-use interface, which checks for available updates to your Dashboard widgets.
Cons: None significant.