Yongfook.com
Has released a handy WP plugin that allows for the instant creation of a Google World Map to, in the author’s own words:

• If you blog on the road, keep track of where you blogged from.
• If you review a restaurant / art exhibition / concert etc, show us where you are talking about.
• If you are blogging about something that can be related to a specific place (e.g. a past holiday, something that caught your eye in the news) you can put it on the map.