WordPress have a built-in widget that allows you to display any RSS feed on your blog. Although this widget is great, sometimes you may wish it refresh more often. Here is a simple solution to modify the widget refresh rate.

To apply this trick, simply put the following code into your functions.php file:

 add_filter( 'wp_feed_cache_transient_lifetime', create_function('$a', 'return 600;') ); 

Thanks to Smashing Magazine for the code!