Hello Bob,
Ellis Island was closed as an immigrant receiving center in 1924 which
is why the Ellis Island Foundation's database ends with 1924. The New
York passenger arrival records were still kept after 1924 (and are
available on microfilm), but the passengers were no longer inspected at
Ellis Island. These two links have more information...
Ellis Island, Castle Garden & the Barge Office
New York's Immigrant Processing Centers
http://germanroots.home.att.net/ellisisland/
Finding New York Passenger Arrival Records 1820-1957
http://germanroots.home.att.net/ellisisland/nypassengers.html
Regards,
Joe