This is the list of things that you are supposed to carry along with you to the consulate for the VISA interview. This information is to the best of my knowledge as far as US Consulate at Mumbai is concerned. I arranged all the materials in a "HARMONIUM" file. This is a kind of file which has many sections and has a small tag holder for every section, where you can place a small tag about what the section holds, so that when u put your finger on that tab and open the section you get the required documents. You can get a "HARMONIUM" style file for around 250 to 325 Rs.
Now getting back to the list of documents, they are listed as I arranged them in order from the outermost section in my file-folder. Its upto your convenience as to how you arrange them.
Salary Certificate (Latest) and Employment Certificate if sponsor is doing a job. If tax is deducted at the source by the company, carry the TDS certificate as well.
If sponsor is a businessman then...
Income-Tax Returns of the Company (atleast 2 years).
Things to be kept in your mind while preparing the file and all the other document: