can u pls explain in detail.u want to display all list  ittems as pop up menu for hover event?

I don't know about the google  map connections but in case if live earth intrests you then checkout this sharepoint  team blog:
blogs.msdn.com/.../...arth-maps-on-sharepoint.aspx

Also checkout codeplex for Google maps web part:
http://googlemapswebpart.codeplex.com/

Yes I want to display the titles from the list  depending on the states.
For eg if Virginia is a state  and user keeps his mouse  on Virginia he should be able to see all the list items having state as Virginia.

Since you want input to come from your map  and not from the list  which is what most of the codeplex components do, I would suggest a even simpler solution
Just create a user control with a US maps with states, and on hover of any state  you can capture the event and filter yout list.

I think the 2010 visual studio has some better map controls, you can use those as well.

I have done the exact functionality for pfizer client.

u can do that with the custom xslt rendering approach in a custom web part means we have to replicate the content editor web part so as to render the google  api based map  control.