This method, although similar to the method I covered in my last post, uses the InfoWindow of the map rather than a rollover associated with a Point Of Interest (POI). The InfoWindow is populated with the title and content when the overlay is moused-over, and follows the cursor, similar to a tooltip.
The biggest disadvantage with this method comes from the need to step outside of the API to attach a mousemove event. This means that the solution needs to take browser differences into consideration. In order to simplify the code, and because I generally use ASP.NET for most of my work, you will notice that I have utilized a few shortcuts provided by the Microsoft AJAX Library.