This widget displays Etsy items (from favourites or store) in a widget, without using flash or an iframe, which allows greater theme integration.
Etsy developer guidelines suggest that item results should be cached for 6 hours to reduce the amount of load on their servers.
Because the widget does not add a Flash element or an iframe, the theme CSS should be inherited from the sidebar style.
The table that the widget builds has the class etsyItemTable, which can be used to style the widget. If you want to override the default styles, you can do so using the !important keyword.
By default, the widget refreshes the data every 6 hours, which can be a lengthy process if you have a lot of items in your store/favourites. The next time you load the page you will notice the time is significantly less.
You can customise this behaviour in the Advanced settings section of the widget control panel.
If you get script execution timeouts, I suggest you change to displaying newest items, as this restricts the data update to only the number of items you are displaying.
You must have your favourites set to public for you to be able to show your favourites with this widget.