Various links, I hope they help.
I have visited these links and found them all most helpful. I hope you also find something worth while in them.
Passenger Arrival Lists for Miscellaneous Atlantic, Gulf Coast & Great Lakes Ports 1820-1873 FHL and NARA Microfilm Catalog
Numbers with links to indexes
SHIPS TO PENNSYLVANIA and OATHS OF ALLEGIANCE, 1727-1775
New Orleans Passenger Lists 1820-1902 FHL and NARA Microfilm Catalog Numbers
Finding Passenger Arrival Records at the Port of Boston, Massachusetts 1820-1943
U.S. Passenger Arrival Lists - FHL microfilm numbers Passenger Lists of Vessels Arriving at New York, NY, 1897-1842. June
16, 1897 - Dec. 31, 1942.
The Winthrop Fleet
Baltimore Passenger Lists 1820-1891
Port of New York, New York, 1820-1957
Mariners and ships in Australian waters
Unassisted Shipping Index Index of Inward Passenger Lists for British and Foreign Ports 1852-1889
New York Passenger Lists 1820-1897 FHL and NARA Microfilm Catalog Numbers
Opening/Closing of Various Canadian Ports and Canals and the Hudson River and Erie Canal
TSL Canadian Arrivals
Palmer List of Merchant Vessels
The S.S. England Page
Online German Emigration Databases
Finding Passenger Lists 1820 to the 1940s arrivals at US ports from Europe
Names of Mecklenburg-Schwerin Emigrants 1844-1915
Records of the U.S. Customs Service, 1820--ca. 1891
Peter Hodge's Genealogy Research Page