Wordpress has this awesome plugin (well most of them all are awesome) which shows posts or pages in Tree type drop down menu, something like what we see in windows sidebar with categories represented as folders and posts as pages.

The Tree (windows folder type) drop down menu is using Scriptaculous library and is based on dTree and the plugin is fully compatible with latest version of wordpress. Now when plugins uses javascript libraries like Scriptaculous, they often create loading and performance issues but this plugin seems to not have that (its based on similar wordpresss plugin which had this problem). In any case, if you are looking to increase the performance of your blog, you may like to look at these wordpress plugins too

Some of the features of this Tree type drop down menu plugin is -

1. It can be used for posts, pages, links and categories.
2. Much better performance and less loading time
3. Options for truncating and opened tree branches

and many more. You can download the Tree like windows folder based navigation menu from here

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