Here is my list of recommended plugins for LightWord Theme and Wordpress:
Simple Tags adds more functionallity for tagging. You can get Simple Tags here
Breadcrumbs help your visitors to navigate on your webpage. To my mind, the yoast breadcrumbs plugin does a pretty good job.
When you write interesting content on your website you probable want it to be read. Sociable let your readers submit your post to a various number of social bookmarks.