I have searched and not seen any reference to this issue. I apologize if
it has been brought up already.
In pgAdmin III version 1.16.1 the smallserial data type is not listed
when creating a new column. It works fine when later editing the SQL
manually.
This was added in Postgres 9.2
http://www.postgresql.org/docs/9.2/interactive/datatype-numeric.html
MS