A widget to show recent posts list based on categories or tags
Custom Recent Posts Widget
Custom Recent Post Widget when added to sidebar on widget menu. Here the number of posts to show is set to 6 and only the 'Wordpress' category is selected
Custom Recent Post Widget showing a list of 6 recent posts from the category 'Wordpress'
Custom Recent Post Widget in Kennneth John Odle's blog
Custom Recent Posts by Tags Widget
Custom Recent Posts by Tags Widget configuration
Custom Recent Posts widget with date in 2012 theme