Version 3.5.3.5 has just been uploaded to the site. The latest version includes some changes to the control rendering which should make it more unlikely to trigger the "Operation Aborted Error" in Internet Explorer.
The clientside script has also been extended to handle clientside handlers for JsonPolylines and JsonPolygons. This means that you can set their clientside event handlers on the server and have them registered when they have been sent to the page though a scriptmethod. The reimers.map.convertToGPolyline and reimers.map.convertToGPolygon methods now register the included event handlers automatically.
The latest version has adds support for Moon and Mars maps. In addition to the 3 default map types, users can now display a terrain map of Earth as well as infrared maps, elevation maps and visible maps of both Mars and the Moon. They are added as other maps, but be aware that Moon and Mars maps do not cover the whole surface.
The new GoogleGroundOverlay lets users put an image on a map to cover the defined bounds. Add the ground overlay as any other overlay. The image must be a publicly accessible image.