Recently i am playing with Google map. it is really fun. i am thinking i will share my experience through my blog.
problem: i want to set a center point
answer: you can use map.setCenter(new GLatLng(35.746512259918504,-42.1875), 2);
here 35.xxx is lat, -42.xx is lng and 2 is zoom level.
how to use:
1. you can use “setCenter” when you instantiating an map object. for example:
var map = new GMap2(…);
map.setCenter(..);
2. you can use after completing your initial process. for example:
setCenter after loading marker from GDowloadUrl.
best of luck 
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nice to see that u are now involved with Google:D and playing with longi-lati around the world.
geo tagging will be one of the fastest growing services in the next few years, i believe. everything and everyone belongs somewhere, and we have based our whole company idea upon this fact. the sooner we can start integrating simple, but smart google map/earth application in our services, the better it will be for our users.
everyone knows hasin as mr. blog, i think you should apply your skills on mapping, get the somewhere in… map everywhere, and be known in bangladesh as mr. map, or mr. googlemap, or mr. somewhere!