first let me tell you clearly that isro has not taken much care to bulid the primary viewing site before launch which was http://bhuvan.nrsc.gov.in/ and was down due to web traffic for almost 36 hours, the new site is working and providing much information on bhuvan operation till the time of writing, which is http://bhuvan2.nrsc.gov.in/
now afrer 2 days both sites are working seamlessly with the same content.they are now like mirror sites.
users have to register(mandatory) through the site before downloading the software plugin to access maps.also user needs to have direct x9 or higher (install).also u need to have microsoft.net (install)
click here to install bhuvan here
1)user have to download the above software close to 10 mb in size and install it in order to view map.
2)once u download and install, go to bhuvan site and log in.a new window will open up with the google earth like interface.
this software piece is called (TerraExplorer Viewer version 5.1.2.f15)actually a 3d mapping software and can be integrated for 3d mapping of terrain and has been developed by a us company called Skyline Software Systems .this software has been used as a platform to view bhuvan satellite imagery.
one down of bhuvan is its very network hungry atleast Network Speed: 768 Kbits/sec is expected to navigate properly, but alas in india we cant expect it everywhere when broadband speed beyond 256 kbps is confined mainly in urban areas.