I've been hunting around a for good free plugin simply to show the location of a store for a client.
There are plugins that break the scrolling, others that are free but you have to pay to upgrade to add a description.. etc.
This one is free and has a lot of features. I love that the marker can be at one location and the center of the map can be another location.
The plugin I've found for this so I won't be looking any more.