This link will allow you to look up information about a person currently or recently incarcerated in the NYC Corrections facilities.  It will give bail, charges and location information.

NYC Dept of Corrections Inmate Lookup

This link will allow you to search for inmates in the custody of the New York State Dept. of Corrections.  It will also allow you to search on the names of people who had been in the system back to the early 1970's, except for Youthful Offenders and inmates whose convictions have been reversed.

NY State Dept. of Corrections Inmate Lookup