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Oh, that's interesting. Perhaps I am missing the obvious! But, just to be clear, what I am talking about is a menu option (at the same level as Settings, and Administration) called Themes. When you click that, you get a collection of thumbnails - at the bottom of the screen - showing different themes. Click on one of those and the whole theme of the site is changed.
Is that the feature that is already built into 1.8?
By the way, is there some way to subscribe to this thread so that I get email notification when a new comment is added?
In the plugin settings page, you can filter the plugins as themes. If the themes include screenshots in their package, you will be able to see the thumbnails too. This is a feature in 1.8
Oh, I see what you mean! That's very neat. I shall go and experiment