FamilySearch released Maryland, Baltimore Passenger Lists Index, 1820-1897 on 23 December.
For those unfamiliar with this collection, it is a digital version of NARA publication M327: Index to Passenger Lists of Vessels Arriving at Baltimore (Federal Passenger Lists), 1820-1897.
This collection is a Soundex index to the passenger lists. To use the collection, researchers need the Soundex code for the last name of interest. This can be obtained using the Soundex Converter at Rootsweb. The cards are organized by Soundex code and then by first name.