copying between Postgres databases

Hi;
I've got two questions:

1) What is the best way to copy a Postgres table in one database into another
Postgres database? Is it possible to copy the structure and the data at the
same time?

2) Is there a way to do a short of pg_dump and to use the resulting file as
input to another database, but preserving existing tables in this latter?

Thanks and regards

Javier