I'm a recent convert to WordPress and one of the top 3 plugins for me was RichSnippets. Of all that I have tested, "All In One Schema.org Rich Snippets" is the best. It provides an easy-to-use interface in adding richsnippet data with all options available.
The front-end labels are also customizable, especially good for those using other languages than English. The front-end display also works out-of-box, no need to do HTML and CSS editing, it just works.
Google and other Schema.org "consumers" can see your data and display it on their respective clients. The blogger? Not a sweat.
All In One Schema.org Rich Snippets WP plugin is a must have, especially if you care about your ranking and getting those searchers to click your link.