Recognises users by IP address and shows them converted values in their local currency, you can write post/pages in multiple currencies.
Extra features may be implemented if I find them usefull/interesting and if I have time to develop them. Feel free to propose them.
=I use the shortcode in another plugin (like wp-table-reloaded) and the convesions are not working= This is because in this cases the WorldCurrency plugin is not aware of the presence of these conversions and the necessary code is not loaded. You can add a wc_force = 1 custom field to posts or pages to force the loading of the necessary code in this cases.