I found this - thought I would share:
This list from Travisa Outsourcing is for Americans with new Entry visas...probably about the same for all nationalities:
List of documents required at the time of registration with the Foreigners Registration Officer.
(i) Photocopy of the passport and initial visa.
(ii) Four photographs of the applicant.
(iii) Details of residence in India.
(iv) HIV test report from one of the WHO recognized institutions from people in the age group of 15 to 60 years, if the foreigner is visiting India on a visa for more than one year.
(v) Copy of the marriage certificate in case of those seeking extension of stay on grounds of being married to an Indian national.
(vi) Bona-fide certificate from the University/college/ institution in case of student visa.
(vii) Accreditation certificate from the Press Information Bureau in case of Journalist visa.
(viii) Approval of the Department of Company Affairs in the case of board level appointees in Public limited companies.
(ix) Two copies of the approval of Government of India in case of a joint venture or a collaboration.
(x) Terms and conditions of appointments and copy of contract or agreements, in case of employment visa.
(xi) Undertaking (in the format given below) from the concerned Indian company on the following lines in case of employment/business visa: -
UNDERTAKING
We take full responsibility for the activities and conduct of Mr./Mrs. ____________ _______ national of ____________ during his/her stay in India. If anything adverse comes to notice during this period, we undertake to repatriate him/her on our cost.
Date: Signature of competent authority
Seal: (of the Company)