For a project I worked on recently I created a small and simple image rotator plugin for jQuery. It’s dead easy to embed in your own page and to style the way you want using regular CSS.
The plugin is released under both MIT and GPL licenses so you can use it any way you want in both personal and commercial projects.
One of the shortcomings in the Google Maps API is that there’s no easy way to add tooltips to polylines and polygons. That’s why I felt inclined to build an extension to Google Maps that adds that functionality. MapTooltip makes it possible to add tooltips to any kind of overlay. It’s even possible to have HTML inside it and to style it to fit your design needs.